Finding the Fourth Proportional to 11,641.32, 16,068.78 and 8,656.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,641.32 : 16,068.78 = 8,656.20 : x
2. Step 2: Convert to fraction form
   11,641.32/16,068.78 = 8,656.20/x
3. Step 3: Cross multiply
   11,641.32x = 16,068.78 × 8,656.20
4. Step 4: Simplify right side
   11,641.32x = 139,094,573.44
5. Step 5: Solve for x
   x = 139,094,573.44/11,641.32
6. Step 6: Final answer
   x = 11,948.35