Finding the Fourth Proportional to 72,003.47, 99,365.13 and 40,173.71

Step by Step Solution

1. Step 1: Write the proportion equation
   72,003.47 : 99,365.13 = 40,173.71 : x
2. Step 2: Convert to fraction form
   72,003.47/99,365.13 = 40,173.71/x
3. Step 3: Cross multiply
   72,003.47x = 99,365.13 × 40,173.71
4. Step 4: Simplify right side
   72,003.47x = 3,991,865,419.91
5. Step 5: Solve for x
   x = 3,991,865,419.91/72,003.47
6. Step 6: Final answer
   x = 55,439.91