Finding the Fourth Proportional to 10,215.76, 14,098.12 and 5,739.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.76 : 14,098.12 = 5,739.60 : x
2. Step 2: Convert to fraction form
   10,215.76/14,098.12 = 5,739.60/x
3. Step 3: Cross multiply
   10,215.76x = 14,098.12 × 5,739.60
4. Step 4: Simplify right side
   10,215.76x = 80,917,569.55
5. Step 5: Solve for x
   x = 80,917,569.55/10,215.76
6. Step 6: Final answer
   x = 7,920.86