Finding the Fourth Proportional to 12,863.54, 17,746.46 and 8,385.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,863.54 : 17,746.46 = 8,385.72 : x
2. Step 2: Convert to fraction form
   12,863.54/17,746.46 = 8,385.72/x
3. Step 3: Cross multiply
   12,863.54x = 17,746.46 × 8,385.72
4. Step 4: Simplify right side
   12,863.54x = 148,816,844.55
5. Step 5: Solve for x
   x = 148,816,844.55/12,863.54
6. Step 6: Final answer
   x = 11,568.89