Finding the Fourth Proportional to 12,656.72, 18,993.36 and 5,731.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,656.72 : 18,993.36 = 5,731.28 : x
2. Step 2: Convert to fraction form
   12,656.72/18,993.36 = 5,731.28/x
3. Step 3: Cross multiply
   12,656.72x = 18,993.36 × 5,731.28
4. Step 4: Simplify right side
   12,656.72x = 108,856,264.30
5. Step 5: Solve for x
   x = 108,856,264.30/12,656.72
6. Step 6: Final answer
   x = 8,600.67