Finding the Fourth Proportional to 1,426.88, 2,139.96 and 452.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.88 : 2,139.96 = 452.72 : x
2. Step 2: Convert to fraction form
   1,426.88/2,139.96 = 452.72/x
3. Step 3: Cross multiply
   1,426.88x = 2,139.96 × 452.72
4. Step 4: Simplify right side
   1,426.88x = 968,802.69
5. Step 5: Solve for x
   x = 968,802.69/1,426.88
6. Step 6: Final answer
   x = 678.97