Finding the Fourth Proportional to 12,642.84, 17,443.62 and 8,166.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,642.84 : 17,443.62 = 8,166.78 : x
2. Step 2: Convert to fraction form
   12,642.84/17,443.62 = 8,166.78/x
3. Step 3: Cross multiply
   12,642.84x = 17,443.62 × 8,166.78
4. Step 4: Simplify right side
   12,642.84x = 142,458,206.94
5. Step 5: Solve for x
   x = 142,458,206.94/12,642.84
6. Step 6: Final answer
   x = 11,267.90