Finding the Fourth Proportional to 12,478.59, 17,216.32 and 8,231.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,478.59 : 17,216.32 = 8,231.76 : x
2. Step 2: Convert to fraction form
   12,478.59/17,216.32 = 8,231.76/x
3. Step 3: Cross multiply
   12,478.59x = 17,216.32 × 8,231.76
4. Step 4: Simplify right side
   12,478.59x = 141,720,573.16
5. Step 5: Solve for x
   x = 141,720,573.16/12,478.59
6. Step 6: Final answer
   x = 11,357.10