Finding the Fourth Proportional to 12,371.32, 17,078.30 and 8,290.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,371.32 : 17,078.30 = 8,290.15 : x
2. Step 2: Convert to fraction form
   12,371.32/17,078.30 = 8,290.15/x
3. Step 3: Cross multiply
   12,371.32x = 17,078.30 × 8,290.15
4. Step 4: Simplify right side
   12,371.32x = 141,581,711.75
5. Step 5: Solve for x
   x = 141,581,711.75/12,371.32
6. Step 6: Final answer
   x = 11,444.35