Finding the Fourth Proportional to 12,678.18, 17,500.29 and 8,712.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.18 : 17,500.29 = 8,712.42 : x
2. Step 2: Convert to fraction form
   12,678.18/17,500.29 = 8,712.42/x
3. Step 3: Cross multiply
   12,678.18x = 17,500.29 × 8,712.42
4. Step 4: Simplify right side
   12,678.18x = 152,469,876.60
5. Step 5: Solve for x
   x = 152,469,876.60/12,678.18
6. Step 6: Final answer
   x = 12,026.16