Finding the Fourth Proportional to 14,426.89, 19,909.71 and 8,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   14,426.89 : 19,909.71 = 8,139.25 : x
2. Step 2: Convert to fraction form
   14,426.89/19,909.71 = 8,139.25/x
3. Step 3: Cross multiply
   14,426.89x = 19,909.71 × 8,139.25
4. Step 4: Simplify right side
   14,426.89x = 162,050,107.12
5. Step 5: Solve for x
   x = 162,050,107.12/14,426.89
6. Step 6: Final answer
   x = 11,232.50