Finding the Fourth Proportional to 1,426.53, 2,139.57 and 452.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.53 : 2,139.57 = 452.50 : x
2. Step 2: Convert to fraction form
   1,426.53/2,139.57 = 452.50/x
3. Step 3: Cross multiply
   1,426.53x = 2,139.57 × 452.50
4. Step 4: Simplify right side
   1,426.53x = 968,155.43
5. Step 5: Solve for x
   x = 968,155.43/1,426.53
6. Step 6: Final answer
   x = 678.68