Finding the Fourth Proportional to 54,423.50, 81,614.27 and 21,139.18

Step by Step Solution

1. Step 1: Write the proportion equation
   54,423.50 : 81,614.27 = 21,139.18 : x
2. Step 2: Convert to fraction form
   54,423.50/81,614.27 = 21,139.18/x
3. Step 3: Cross multiply
   54,423.50x = 81,614.27 × 21,139.18
4. Step 4: Simplify right side
   54,423.50x = 1,725,258,592.91
5. Step 5: Solve for x
   x = 1,725,258,592.91/54,423.50
6. Step 6: Final answer
   x = 31,700.62