Finding the Fourth Proportional to 42,048.56, 63,078.90 and 13,959.08

Step by Step Solution

1. Step 1: Write the proportion equation
   42,048.56 : 63,078.90 = 13,959.08 : x
2. Step 2: Convert to fraction form
   42,048.56/63,078.90 = 13,959.08/x
3. Step 3: Cross multiply
   42,048.56x = 63,078.90 × 13,959.08
4. Step 4: Simplify right side
   42,048.56x = 880,523,411.41
5. Step 5: Solve for x
   x = 880,523,411.41/42,048.56
6. Step 6: Final answer
   x = 20,940.63