Finding the Fourth Proportional to 12,936.68, 17,851.92 and 7,631.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,936.68 : 17,851.92 = 7,631.72 : x
2. Step 2: Convert to fraction form
   12,936.68/17,851.92 = 7,631.72/x
3. Step 3: Cross multiply
   12,936.68x = 17,851.92 × 7,631.72
4. Step 4: Simplify right side
   12,936.68x = 136,240,854.90
5. Step 5: Solve for x
   x = 136,240,854.90/12,936.68
6. Step 6: Final answer
   x = 10,531.36