Finding the Fourth Proportional to 112,591.50, 155,314.83 and 72,311.40

Step by Step Solution

1. Step 1: Write the proportion equation
   112,591.50 : 155,314.83 = 72,311.40 : x
2. Step 2: Convert to fraction form
   112,591.50/155,314.83 = 72,311.40/x
3. Step 3: Cross multiply
   112,591.50x = 155,314.83 × 72,311.40
4. Step 4: Simplify right side
   112,591.50x = 11,231,032,798.06
5. Step 5: Solve for x
   x = 11,231,032,798.06/112,591.50
6. Step 6: Final answer
   x = 99,750.27