Finding the Fourth Proportional to 72,081.37, 99,471.90 and 39,818.21

Step by Step Solution

1. Step 1: Write the proportion equation
   72,081.37 : 99,471.90 = 39,818.21 : x
2. Step 2: Convert to fraction form
   72,081.37/99,471.90 = 39,818.21/x
3. Step 3: Cross multiply
   72,081.37x = 99,471.90 × 39,818.21
4. Step 4: Simplify right side
   72,081.37x = 3,960,793,289.31
5. Step 5: Solve for x
   x = 3,960,793,289.31/72,081.37
6. Step 6: Final answer
   x = 54,948.91