Finding the Fourth Proportional to 10,215.72, 14,098.45 and 5,739.86

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.72 : 14,098.45 = 5,739.86 : x
2. Step 2: Convert to fraction form
   10,215.72/14,098.45 = 5,739.86/x
3. Step 3: Cross multiply
   10,215.72x = 14,098.45 × 5,739.86
4. Step 4: Simplify right side
   10,215.72x = 80,923,129.22
5. Step 5: Solve for x
   x = 80,923,129.22/10,215.72
6. Step 6: Final answer
   x = 7,921.43