Finding the Fourth Proportional to 12,785.09, 17,643.39 and 7,478.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,785.09 : 17,643.39 = 7,478.87 : x
2. Step 2: Convert to fraction form
   12,785.09/17,643.39 = 7,478.87/x
3. Step 3: Cross multiply
   12,785.09x = 17,643.39 × 7,478.87
4. Step 4: Simplify right side
   12,785.09x = 131,952,531.95
5. Step 5: Solve for x
   x = 131,952,531.95/12,785.09
6. Step 6: Final answer
   x = 10,320.82