Finding the Fourth Proportional to 12,402.30, 17,108.74 and 7,678.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,402.30 : 17,108.74 = 7,678.38 : x
2. Step 2: Convert to fraction form
   12,402.30/17,108.74 = 7,678.38/x
3. Step 3: Cross multiply
   12,402.30x = 17,108.74 × 7,678.38
4. Step 4: Simplify right side
   12,402.30x = 131,367,407.04
5. Step 5: Solve for x
   x = 131,367,407.04/12,402.30
6. Step 6: Final answer
   x = 10,592.18