Finding the Fourth Proportional to 72,045.29, 99,422.25 and 40,213.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72,045.29 : 99,422.25 = 40,213.91 : x
2. Step 2: Convert to fraction form
   72,045.29/99,422.25 = 40,213.91/x
3. Step 3: Cross multiply
   72,045.29x = 99,422.25 × 40,213.91
4. Step 4: Simplify right side
   72,045.29x = 3,998,156,765.58
5. Step 5: Solve for x
   x = 3,998,156,765.58/72,045.29
6. Step 6: Final answer
   x = 55,495.05