Finding the Fourth Proportional to 99.72, 137.48 and 83.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99.72 : 137.48 = 83.32 : x
2. Step 2: Convert to fraction form
   99.72/137.48 = 83.32/x
3. Step 3: Cross multiply
   99.72x = 137.48 × 83.32
4. Step 4: Simplify right side
   99.72x = 11,454.83
5. Step 5: Solve for x
   x = 11,454.83/99.72
6. Step 6: Final answer
   x = 114.87