Finding the Fourth Proportional to 72,139,563.71, 99,561,817.58 and 40,351,499.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72,139,563.71 : 99,561,817.58 = 40,351,499.91 : x
2. Step 2: Convert to fraction form
   72,139,563.71/99,561,817.58 = 40,351,499.91/x
3. Step 3: Cross multiply
   72,139,563.71x = 99,561,817.58 × 40,351,499.91
4. Step 4: Simplify right side
   72,139,563.71x = 4,017,468,672,917,048.50
5. Step 5: Solve for x
   x = 4,017,468,672,917,048.50/72,139,563.71
6. Step 6: Final answer
   x = 55,690,226.92