Finding the Fourth Proportional to 12,689.76, 17,511.84 and 7,384.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,689.76 : 17,511.84 = 7,384.89 : x
2. Step 2: Convert to fraction form
   12,689.76/17,511.84 = 7,384.89/x
3. Step 3: Cross multiply
   12,689.76x = 17,511.84 × 7,384.89
4. Step 4: Simplify right side
   12,689.76x = 129,323,012.10
5. Step 5: Solve for x
   x = 129,323,012.10/12,689.76
6. Step 6: Final answer
   x = 10,191.13