Finding the Fourth Proportional to 1,659.30, 2,488.94 and 426.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.30 : 2,488.94 = 426.72 : x
2. Step 2: Convert to fraction form
   1,659.30/2,488.94 = 426.72/x
3. Step 3: Cross multiply
   1,659.30x = 2,488.94 × 426.72
4. Step 4: Simplify right side
   1,659.30x = 1,062,080.48
5. Step 5: Solve for x
   x = 1,062,080.48/1,659.30
6. Step 6: Final answer
   x = 640.08