Finding the Fourth Proportional to 21,123.20, 31,682.40 and 5,542.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.20 : 31,682.40 = 5,542.04 : x
2. Step 2: Convert to fraction form
   21,123.20/31,682.40 = 5,542.04/x
3. Step 3: Cross multiply
   21,123.20x = 31,682.40 × 5,542.04
4. Step 4: Simplify right side
   21,123.20x = 175,585,128.10
5. Step 5: Solve for x
   x = 175,585,128.10/21,123.20
6. Step 6: Final answer
   x = 8,312.43