Finding the Fourth Proportional to 21,139.97, 31,707.43 and 5,558.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,139.97 : 31,707.43 = 5,558.81 : x
2. Step 2: Convert to fraction form
   21,139.97/31,707.43 = 5,558.81/x
3. Step 3: Cross multiply
   21,139.97x = 31,707.43 × 5,558.81
4. Step 4: Simplify right side
   21,139.97x = 176,255,406.52
5. Step 5: Solve for x
   x = 176,255,406.52/21,139.97
6. Step 6: Final answer
   x = 8,337.54