Finding the Fourth Proportional to 88.72, 133.02 and 78.59

Step by Step Solution

1. Step 1: Write the proportion equation
   88.72 : 133.02 = 78.59 : x
2. Step 2: Convert to fraction form
   88.72/133.02 = 78.59/x
3. Step 3: Cross multiply
   88.72x = 133.02 × 78.59
4. Step 4: Simplify right side
   88.72x = 10,454.04
5. Step 5: Solve for x
   x = 10,454.04/88.72
6. Step 6: Final answer
   x = 117.83