Finding the Fourth Proportional to 78.88, 118 and 62.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78.88 : 118 = 62.72 : x
2. Step 2: Convert to fraction form
   78.88/118 = 62.72/x
3. Step 3: Cross multiply
   78.88x = 118 × 62.72
4. Step 4: Simplify right side
   78.88x = 7,400.96
5. Step 5: Solve for x
   x = 7,400.96/78.88
6. Step 6: Final answer
   x = 93.83