Finding the Fourth Proportional to 99.52, 137.32 and 60.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99.52 : 137.32 = 60.72 : x
2. Step 2: Convert to fraction form
   99.52/137.32 = 60.72/x
3. Step 3: Cross multiply
   99.52x = 137.32 × 60.72
4. Step 4: Simplify right side
   99.52x = 8,338.07
5. Step 5: Solve for x
   x = 8,338.07/99.52
6. Step 6: Final answer
   x = 83.78