Finding the Fourth Proportional to 72,050.29, 99,425.27 and 40,221.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,050.29 : 99,425.27 = 40,221.20 : x
2. Step 2: Convert to fraction form
   72,050.29/99,425.27 = 40,221.20/x
3. Step 3: Cross multiply
   72,050.29x = 99,425.27 × 40,221.20
4. Step 4: Simplify right side
   72,050.29x = 3,999,004,018.84
5. Step 5: Solve for x
   x = 3,999,004,018.84/72,050.29
6. Step 6: Final answer
   x = 55,502.96