Finding the Fourth Proportional to 12,785.72, 17,643.22 and 7,407.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,785.72 : 17,643.22 = 7,407.32 : x
2. Step 2: Convert to fraction form
   12,785.72/17,643.22 = 7,407.32/x
3. Step 3: Cross multiply
   12,785.72x = 17,643.22 × 7,407.32
4. Step 4: Simplify right side
   12,785.72x = 130,688,869.64
5. Step 5: Solve for x
   x = 130,688,869.64/12,785.72
6. Step 6: Final answer
   x = 10,221.48