Finding the Fourth Proportional to 1,659.10, 2,488.64 and 426.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.10 : 2,488.64 = 426.52 : x
2. Step 2: Convert to fraction form
   1,659.10/2,488.64 = 426.52/x
3. Step 3: Cross multiply
   1,659.10x = 2,488.64 × 426.52
4. Step 4: Simplify right side
   1,659.10x = 1,061,454.73
5. Step 5: Solve for x
   x = 1,061,454.73/1,659.10
6. Step 6: Final answer
   x = 639.78