Finding the Fourth Proportional to 12,641.40, 17,437.61 and 8,167.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,641.40 : 17,437.61 = 8,167.79 : x
2. Step 2: Convert to fraction form
   12,641.40/17,437.61 = 8,167.79/x
3. Step 3: Cross multiply
   12,641.40x = 17,437.61 × 8,167.79
4. Step 4: Simplify right side
   12,641.40x = 142,426,702.51
5. Step 5: Solve for x
   x = 142,426,702.51/12,641.40
6. Step 6: Final answer
   x = 11,266.69