Finding the Fourth Proportional to 12,642.09, 17,442.58 and 8,166.03

Step by Step Solution

1. Step 1: Write the proportion equation
   12,642.09 : 17,442.58 = 8,166.03 : x
2. Step 2: Convert to fraction form
   12,642.09/17,442.58 = 8,166.03/x
3. Step 3: Cross multiply
   12,642.09x = 17,442.58 × 8,166.03
4. Step 4: Simplify right side
   12,642.09x = 142,436,631.56
5. Step 5: Solve for x
   x = 142,436,631.56/12,642.09
6. Step 6: Final answer
   x = 11,266.86