Finding the Fourth Proportional to 12,200.16, 16,838.02 and 7,724.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,200.16 : 16,838.02 = 7,724.32 : x
2. Step 2: Convert to fraction form
   12,200.16/16,838.02 = 7,724.32/x
3. Step 3: Cross multiply
   12,200.16x = 16,838.02 × 7,724.32
4. Step 4: Simplify right side
   12,200.16x = 130,062,335.17
5. Step 5: Solve for x
   x = 130,062,335.17/12,200.16
6. Step 6: Final answer
   x = 10,660.71