Finding the Fourth Proportional to 12,721.31, 19,081.63 and 5,699.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,721.31 : 19,081.63 = 5,699.42 : x
2. Step 2: Convert to fraction form
   12,721.31/19,081.63 = 5,699.42/x
3. Step 3: Cross multiply
   12,721.31x = 19,081.63 × 5,699.42
4. Step 4: Simplify right side
   12,721.31x = 108,754,223.65
5. Step 5: Solve for x
   x = 108,754,223.65/12,721.31
6. Step 6: Final answer
   x = 8,548.98