Finding the Fourth Proportional to 12,688.86, 17,509.10 and 7,384.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688.86 : 17,509.10 = 7,384.62 : x
2. Step 2: Convert to fraction form
   12,688.86/17,509.10 = 7,384.62/x
3. Step 3: Cross multiply
   12,688.86x = 17,509.10 × 7,384.62
4. Step 4: Simplify right side
   12,688.86x = 129,298,050.04
5. Step 5: Solve for x
   x = 129,298,050.04/12,688.86
6. Step 6: Final answer
   x = 10,189.89