Finding the Fourth Proportional to 99.72, 137.52 and 83.52

Step by Step Solution

1. Step 1: Write the proportion equation
   99.72 : 137.52 = 83.52 : x
2. Step 2: Convert to fraction form
   99.72/137.52 = 83.52/x
3. Step 3: Cross multiply
   99.72x = 137.52 × 83.52
4. Step 4: Simplify right side
   99.72x = 11,485.67
5. Step 5: Solve for x
   x = 11,485.67/99.72
6. Step 6: Final answer
   x = 115.18