Finding the Fourth Proportional to 12,081.60, 16,641.42 and 8,538.66

Step by Step Solution

1. Step 1: Write the proportion equation
   12,081.60 : 16,641.42 = 8,538.66 : x
2. Step 2: Convert to fraction form
   12,081.60/16,641.42 = 8,538.66/x
3. Step 3: Cross multiply
   12,081.60x = 16,641.42 × 8,538.66
4. Step 4: Simplify right side
   12,081.60x = 142,095,427.30
5. Step 5: Solve for x
   x = 142,095,427.30/12,081.60
6. Step 6: Final answer
   x = 11,761.31