Finding the Fourth Proportional to 1,426.78, 2,140.78 and 452.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.78 : 2,140.78 = 452.96 : x
2. Step 2: Convert to fraction form
   1,426.78/2,140.78 = 452.96/x
3. Step 3: Cross multiply
   1,426.78x = 2,140.78 × 452.96
4. Step 4: Simplify right side
   1,426.78x = 969,687.71
5. Step 5: Solve for x
   x = 969,687.71/1,426.78
6. Step 6: Final answer
   x = 679.63