Step 1: Start with the fraction 45/78.

Step 2: To convert a fraction into a percentage, divide the numerator by the denominator.

45 ÷ 78 = 0.5769

Step 3: Multiply the result by 100 to get the percentage.

0.5769 × 100 = 57.69%

Final Answer: 45/78 as a percentage is 57.69%.