Finding the Fourth Proportional to 42,078.20, 63,127.18 and 12,496.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,078.20 : 63,127.18 = 12,496.28 : x
2. Step 2: Convert to fraction form
   42,078.20/63,127.18 = 12,496.28/x
3. Step 3: Cross multiply
   42,078.20x = 63,127.18 × 12,496.28
4. Step 4: Simplify right side
   42,078.20x = 788,854,916.89
5. Step 5: Solve for x
   x = 788,854,916.89/42,078.20
6. Step 6: Final answer
   x = 18,747.35