Finding the Fourth Proportional to 12,785.78, 17,643.12 and 7,479.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,785.78 : 17,643.12 = 7,479.56 : x
2. Step 2: Convert to fraction form
   12,785.78/17,643.12 = 7,479.56/x
3. Step 3: Cross multiply
   12,785.78x = 17,643.12 × 7,479.56
4. Step 4: Simplify right side
   12,785.78x = 131,962,774.63
5. Step 5: Solve for x
   x = 131,962,774.63/12,785.78
6. Step 6: Final answer
   x = 10,321.06