Finding the Fourth Proportional to 12,718.85, 17,560.67 and 7,940.66

Step by Step Solution

1. Step 1: Write the proportion equation
   12,718.85 : 17,560.67 = 7,940.66 : x
2. Step 2: Convert to fraction form
   12,718.85/17,560.67 = 7,940.66/x
3. Step 3: Cross multiply
   12,718.85x = 17,560.67 × 7,940.66
4. Step 4: Simplify right side
   12,718.85x = 139,443,182.34
5. Step 5: Solve for x
   x = 139,443,182.34/12,718.85
6. Step 6: Final answer
   x = 10,963.51