Finding the Fourth Proportional to 42,440.27, 63,660.69 and 12,860.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,440.27 : 63,660.69 = 12,860.28 : x
2. Step 2: Convert to fraction form
   42,440.27/63,660.69 = 12,860.28/x
3. Step 3: Cross multiply
   42,440.27x = 63,660.69 × 12,860.28
4. Step 4: Simplify right side
   42,440.27x = 818,694,298.39
5. Step 5: Solve for x
   x = 818,694,298.39/42,440.27
6. Step 6: Final answer
   x = 19,290.51