Finding the Fourth Proportional to 72,171.83, 99,597.47 and 40,340.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,171.83 : 99,597.47 = 40,340.05 : x
2. Step 2: Convert to fraction form
   72,171.83/99,597.47 = 40,340.05/x
3. Step 3: Cross multiply
   72,171.83x = 99,597.47 × 40,340.05
4. Step 4: Simplify right side
   72,171.83x = 4,017,766,468.98
5. Step 5: Solve for x
   x = 4,017,766,468.98/72,171.83
6. Step 6: Final answer
   x = 55,669.45