Finding the Fourth Proportional to 42,076.40, 63,120.96 and 12,490.52

Step by Step Solution

1. Step 1: Write the proportion equation
   42,076.40 : 63,120.96 = 12,490.52 : x
2. Step 2: Convert to fraction form
   42,076.40/63,120.96 = 12,490.52/x
3. Step 3: Cross multiply
   42,076.40x = 63,120.96 × 12,490.52
4. Step 4: Simplify right side
   42,076.40x = 788,413,297.69
5. Step 5: Solve for x
   x = 788,413,297.69/42,076.40
6. Step 6: Final answer
   x = 18,737.66