Finding the Fourth Proportional to 12,228.72, 16,875.72 and 6,639.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,228.72 : 16,875.72 = 6,639.72 : x
2. Step 2: Convert to fraction form
   12,228.72/16,875.72 = 6,639.72/x
3. Step 3: Cross multiply
   12,228.72x = 16,875.72 × 6,639.72
4. Step 4: Simplify right side
   12,228.72x = 112,050,055.60
5. Step 5: Solve for x
   x = 112,050,055.60/12,228.72
6. Step 6: Final answer
   x = 9,162.86