Finding the Fourth Proportional to 42,008.16, 63,012.03 and 12,426.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,008.16 : 63,012.03 = 12,426.15 : x
2. Step 2: Convert to fraction form
   42,008.16/63,012.03 = 12,426.15/x
3. Step 3: Cross multiply
   42,008.16x = 63,012.03 × 12,426.15
4. Step 4: Simplify right side
   42,008.16x = 782,996,936.58
5. Step 5: Solve for x
   x = 782,996,936.58/42,008.16
6. Step 6: Final answer
   x = 18,639.16