Finding the Fourth Proportional to 42,238.26, 63,342.81 and 12,648.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,238.26 : 63,342.81 = 12,648.15 : x
2. Step 2: Convert to fraction form
   42,238.26/63,342.81 = 12,648.15/x
3. Step 3: Cross multiply
   42,238.26x = 63,342.81 × 12,648.15
4. Step 4: Simplify right side
   42,238.26x = 801,169,362.30
5. Step 5: Solve for x
   x = 801,169,362.30/42,238.26
6. Step 6: Final answer
   x = 18,967.86