Finding the Fourth Proportional to 12,339.62, 17,034.30 and 7,869.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,339.62 : 17,034.30 = 7,869.50 : x
2. Step 2: Convert to fraction form
   12,339.62/17,034.30 = 7,869.50/x
3. Step 3: Cross multiply
   12,339.62x = 17,034.30 × 7,869.50
4. Step 4: Simplify right side
   12,339.62x = 134,051,423.85
5. Step 5: Solve for x
   x = 134,051,423.85/12,339.62
6. Step 6: Final answer
   x = 10,863.50