Finding the Fourth Proportional to 99.50, 137.32 and 71.86

Step by Step Solution

1. Step 1: Write the proportion equation
   99.50 : 137.32 = 71.86 : x
2. Step 2: Convert to fraction form
   99.50/137.32 = 71.86/x
3. Step 3: Cross multiply
   99.50x = 137.32 × 71.86
4. Step 4: Simplify right side
   99.50x = 9,867.82
5. Step 5: Solve for x
   x = 9,867.82/99.50
6. Step 6: Final answer
   x = 99.17