Finding the Fourth Proportional to 1,659.07, 2,488.55 and 426.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.07 : 2,488.55 = 426.49 : x
2. Step 2: Convert to fraction form
   1,659.07/2,488.55 = 426.49/x
3. Step 3: Cross multiply
   1,659.07x = 2,488.55 × 426.49
4. Step 4: Simplify right side
   1,659.07x = 1,061,341.69
5. Step 5: Solve for x
   x = 1,061,341.69/1,659.07
6. Step 6: Final answer
   x = 639.72