Finding the Fourth Proportional to 72,025.55, 99,400.88 and 40,199.23

Step by Step Solution

1. Step 1: Write the proportion equation
   72,025.55 : 99,400.88 = 40,199.23 : x
2. Step 2: Convert to fraction form
   72,025.55/99,400.88 = 40,199.23/x
3. Step 3: Cross multiply
   72,025.55x = 99,400.88 × 40,199.23
4. Step 4: Simplify right side
   72,025.55x = 3,995,838,139.32
5. Step 5: Solve for x
   x = 3,995,838,139.32/72,025.55
6. Step 6: Final answer
   x = 55,478.07