Finding the Fourth Proportional to 14,359.48, 21,436.25 and 12,490.81

Step by Step Solution

1. Step 1: Write the proportion equation
   14,359.48 : 21,436.25 = 12,490.81 : x
2. Step 2: Convert to fraction form
   14,359.48/21,436.25 = 12,490.81/x
3. Step 3: Cross multiply
   14,359.48x = 21,436.25 × 12,490.81
4. Step 4: Simplify right side
   14,359.48x = 267,756,009.82
5. Step 5: Solve for x
   x = 267,756,009.82/14,359.48
6. Step 6: Final answer
   x = 18,646.64