Finding the Fourth Proportional to 72,229.92, 99,676.72 and 40,398.80

Step by Step Solution

1. Step 1: Write the proportion equation
   72,229.92 : 99,676.72 = 40,398.80 : x
2. Step 2: Convert to fraction form
   72,229.92/99,676.72 = 40,398.80/x
3. Step 3: Cross multiply
   72,229.92x = 99,676.72 × 40,398.80
4. Step 4: Simplify right side
   72,229.92x = 4,026,819,875.94
5. Step 5: Solve for x
   x = 4,026,819,875.94/72,229.92
6. Step 6: Final answer
   x = 55,750.03