Finding the Fourth Proportional to 42,212.80, 63,309.78 and 12,626.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,212.80 : 63,309.78 = 12,626.80 : x
2. Step 2: Convert to fraction form
   42,212.80/63,309.78 = 12,626.80/x
3. Step 3: Cross multiply
   42,212.80x = 63,309.78 × 12,626.80
4. Step 4: Simplify right side
   42,212.80x = 799,399,930.10
5. Step 5: Solve for x
   x = 799,399,930.10/42,212.80
6. Step 6: Final answer
   x = 18,937.38