Finding the Fourth Proportional to 72,171.14, 99,592.15 and 39,903.89

Step by Step Solution

1. Step 1: Write the proportion equation
   72,171.14 : 99,592.15 = 39,903.89 : x
2. Step 2: Convert to fraction form
   72,171.14/99,592.15 = 39,903.89/x
3. Step 3: Cross multiply
   72,171.14x = 99,592.15 × 39,903.89
4. Step 4: Simplify right side
   72,171.14x = 3,974,114,198.46
5. Step 5: Solve for x
   x = 3,974,114,198.46/72,171.14
6. Step 6: Final answer
   x = 55,065.14