Finding the Fourth Proportional to 12,731.68, 17,567.76 and 7,141.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,731.68 : 17,567.76 = 7,141.60 : x
2. Step 2: Convert to fraction form
   12,731.68/17,567.76 = 7,141.60/x
3. Step 3: Cross multiply
   12,731.68x = 17,567.76 × 7,141.60
4. Step 4: Simplify right side
   12,731.68x = 125,461,914.82
5. Step 5: Solve for x
   x = 125,461,914.82/12,731.68
6. Step 6: Final answer
   x = 9,854.31