Finding the Fourth Proportional to 42,020.88, 63,022.32 and 12,438.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,020.88 : 63,022.32 = 12,438.96 : x
2. Step 2: Convert to fraction form
   42,020.88/63,022.32 = 12,438.96/x
3. Step 3: Cross multiply
   42,020.88x = 63,022.32 × 12,438.96
4. Step 4: Simplify right side
   42,020.88x = 783,932,117.59
5. Step 5: Solve for x
   x = 783,932,117.59/42,020.88
6. Step 6: Final answer
   x = 18,655.78