Finding the Fourth Proportional to 12,839.31, 19,240.13 and 5,821.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.31 : 19,240.13 = 5,821.47 : x
2. Step 2: Convert to fraction form
   12,839.31/19,240.13 = 5,821.47/x
3. Step 3: Cross multiply
   12,839.31x = 19,240.13 × 5,821.47
4. Step 4: Simplify right side
   12,839.31x = 112,005,854.14
5. Step 5: Solve for x
   x = 112,005,854.14/12,839.31
6. Step 6: Final answer
   x = 8,723.67