Finding the Fourth Proportional to 14,427.25, 19,909.61 and 8,139.49

Step by Step Solution

1. Step 1: Write the proportion equation
   14,427.25 : 19,909.61 = 8,139.49 : x
2. Step 2: Convert to fraction form
   14,427.25/19,909.61 = 8,139.49/x
3. Step 3: Cross multiply
   14,427.25x = 19,909.61 × 8,139.49
4. Step 4: Simplify right side
   14,427.25x = 162,054,030.80
5. Step 5: Solve for x
   x = 162,054,030.80/14,427.25
6. Step 6: Final answer
   x = 11,232.50