Finding the Fourth Proportional to 12,784.85, 17,643.22 and 7,478.63

Step by Step Solution

1. Step 1: Write the proportion equation
   12,784.85 : 17,643.22 = 7,478.63 : x
2. Step 2: Convert to fraction form
   12,784.85/17,643.22 = 7,478.63/x
3. Step 3: Cross multiply
   12,784.85x = 17,643.22 × 7,478.63
4. Step 4: Simplify right side
   12,784.85x = 131,947,007.48
5. Step 5: Solve for x
   x = 131,947,007.48/12,784.85
6. Step 6: Final answer
   x = 10,320.58