Finding the Fourth Proportional to 72,139,563.21, 99,561,816.88 and 40,351,499.41

Step by Step Solution

1. Step 1: Write the proportion equation
   72,139,563.21 : 99,561,816.88 = 40,351,499.41 : x
2. Step 2: Convert to fraction form
   72,139,563.21/99,561,816.88 = 40,351,499.41/x
3. Step 3: Cross multiply
   72,139,563.21x = 99,561,816.88 × 40,351,499.41
4. Step 4: Simplify right side
   72,139,563.21x = 4,017,468,595,155,580
5. Step 5: Solve for x
   x = 4,017,468,595,155,580/72,139,563.21
6. Step 6: Final answer
   x = 55,690,226.23