Finding the Fourth Proportional to 12,785.20, 17,642.30 and 9,429.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,785.20 : 17,642.30 = 9,429.82 : x
2. Step 2: Convert to fraction form
   12,785.20/17,642.30 = 9,429.82/x
3. Step 3: Cross multiply
   12,785.20x = 17,642.30 × 9,429.82
4. Step 4: Simplify right side
   12,785.20x = 166,363,713.39
5. Step 5: Solve for x
   x = 166,363,713.39/12,785.20
6. Step 6: Final answer
   x = 13,012.21