Finding the Fourth Proportional to 12,407.30, 17,118.51 and 7,686.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,407.30 : 17,118.51 = 7,686.62 : x
2. Step 2: Convert to fraction form
   12,407.30/17,118.51 = 7,686.62/x
3. Step 3: Cross multiply
   12,407.30x = 17,118.51 × 7,686.62
4. Step 4: Simplify right side
   12,407.30x = 131,583,481.34
5. Step 5: Solve for x
   x = 131,583,481.34/12,407.30
6. Step 6: Final answer
   x = 10,605.33