Finding the Fourth Proportional to 42,380.10, 63,570.56 and 12,798.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42,380.10 : 63,570.56 = 12,798.18 : x
2. Step 2: Convert to fraction form
   42,380.10/63,570.56 = 12,798.18/x
3. Step 3: Cross multiply
   42,380.10x = 63,570.56 × 12,798.18
4. Step 4: Simplify right side
   42,380.10x = 813,587,405.59
5. Step 5: Solve for x
   x = 813,587,405.59/42,380.10
6. Step 6: Final answer
   x = 19,197.39