Finding the Fourth Proportional to 112,449.50, 155,165.30 and 72,217.71

Step by Step Solution

1. Step 1: Write the proportion equation
   112,449.50 : 155,165.30 = 72,217.71 : x
2. Step 2: Convert to fraction form
   112,449.50/155,165.30 = 72,217.71/x
3. Step 3: Cross multiply
   112,449.50x = 155,165.30 × 72,217.71
4. Step 4: Simplify right side
   112,449.50x = 11,205,681,861.64
5. Step 5: Solve for x
   x = 11,205,681,861.64/112,449.50
6. Step 6: Final answer
   x = 99,650.80