Finding the Fourth Proportional to 8,398.32, 12,578.04 and 8,106.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,398.32 : 12,578.04 = 8,106.72 : x
2. Step 2: Convert to fraction form
   8,398.32/12,578.04 = 8,106.72/x
3. Step 3: Cross multiply
   8,398.32x = 12,578.04 × 8,106.72
4. Step 4: Simplify right side
   8,398.32x = 101,966,648.43
5. Step 5: Solve for x
   x = 101,966,648.43/8,398.32
6. Step 6: Final answer
   x = 12,141.31