Finding the Fourth Proportional to 8,479.31, 11,689.94 and 7,150.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8,479.31 : 11,689.94 = 7,150.69 : x
2. Step 2: Convert to fraction form
   8,479.31/11,689.94 = 7,150.69/x
3. Step 3: Cross multiply
   8,479.31x = 11,689.94 × 7,150.69
4. Step 4: Simplify right side
   8,479.31x = 83,591,042.86
5. Step 5: Solve for x
   x = 83,591,042.86/8,479.31
6. Step 6: Final answer
   x = 9,858.24