Finding the Fourth Proportional to 10,215.91, 14,098.31 and 5,739.57

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.91 : 14,098.31 = 5,739.57 : x
2. Step 2: Convert to fraction form
   10,215.91/14,098.31 = 5,739.57/x
3. Step 3: Cross multiply
   10,215.91x = 14,098.31 × 5,739.57
4. Step 4: Simplify right side
   10,215.91x = 80,918,166.64
5. Step 5: Solve for x
   x = 80,918,166.64/10,215.91
6. Step 6: Final answer
   x = 7,920.80