Finding the Fourth Proportional to 42,439.09, 63,665.24 and 12,849.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,439.09 : 63,665.24 = 12,849.88 : x
2. Step 2: Convert to fraction form
   42,439.09/63,665.24 = 12,849.88/x
3. Step 3: Cross multiply
   42,439.09x = 63,665.24 × 12,849.88
4. Step 4: Simplify right side
   42,439.09x = 818,090,470.76
5. Step 5: Solve for x
   x = 818,090,470.76/42,439.09
6. Step 6: Final answer
   x = 19,276.82