Finding the Fourth Proportional to 42,039.36, 63,061.92 and 12,456

Step by Step Solution

1. Step 1: Write the proportion equation
   42,039.36 : 63,061.92 = 12,456 : x
2. Step 2: Convert to fraction form
   42,039.36/63,061.92 = 12,456/x
3. Step 3: Cross multiply
   42,039.36x = 63,061.92 × 12,456
4. Step 4: Simplify right side
   42,039.36x = 785,499,275.52
5. Step 5: Solve for x
   x = 785,499,275.52/42,039.36
6. Step 6: Final answer
   x = 18,684.85