Finding the Fourth Proportional to 12,409.72, 17,115.42 and 7,685.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,409.72 : 17,115.42 = 7,685.08 : x
2. Step 2: Convert to fraction form
   12,409.72/17,115.42 = 7,685.08/x
3. Step 3: Cross multiply
   12,409.72x = 17,115.42 × 7,685.08
4. Step 4: Simplify right side
   12,409.72x = 131,533,371.93
5. Step 5: Solve for x
   x = 131,533,371.93/12,409.72
6. Step 6: Final answer
   x = 10,599.22