Finding the Fourth Proportional to 21,139.59, 31,706.87 and 5,558.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,139.59 : 31,706.87 = 5,558.43 : x
2. Step 2: Convert to fraction form
   21,139.59/31,706.87 = 5,558.43/x
3. Step 3: Cross multiply
   21,139.59x = 31,706.87 × 5,558.43
4. Step 4: Simplify right side
   21,139.59x = 176,240,389.62
5. Step 5: Solve for x
   x = 176,240,389.62/21,139.59
6. Step 6: Final answer
   x = 8,336.98