Finding the Fourth Proportional to 1,426.59, 2,139.67 and 452.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.59 : 2,139.67 = 452.56 : x
2. Step 2: Convert to fraction form
   1,426.59/2,139.67 = 452.56/x
3. Step 3: Cross multiply
   1,426.59x = 2,139.67 × 452.56
4. Step 4: Simplify right side
   1,426.59x = 968,329.06
5. Step 5: Solve for x
   x = 968,329.06/1,426.59
6. Step 6: Final answer
   x = 678.77