Finding the Fourth Proportional to 1,350.78, 2,025.89 and 426.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,350.78 : 2,025.89 = 426.41 : x
2. Step 2: Convert to fraction form
   1,350.78/2,025.89 = 426.41/x
3. Step 3: Cross multiply
   1,350.78x = 2,025.89 × 426.41
4. Step 4: Simplify right side
   1,350.78x = 863,866.89
5. Step 5: Solve for x
   x = 863,866.89/1,350.78
6. Step 6: Final answer
   x = 639.53