Finding the Fourth Proportional to 11,443.08, 15,785.46 and 8,643.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,443.08 : 15,785.46 = 8,643.72 : x
2. Step 2: Convert to fraction form
   11,443.08/15,785.46 = 8,643.72/x
3. Step 3: Cross multiply
   11,443.08x = 15,785.46 × 8,643.72
4. Step 4: Simplify right side
   11,443.08x = 136,445,096.31
5. Step 5: Solve for x
   x = 136,445,096.31/11,443.08
6. Step 6: Final answer
   x = 11,923.81