Finding the Fourth Proportional to 1,725.50, 2,588.27 and 426.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,725.50 : 2,588.27 = 426.98 : x
2. Step 2: Convert to fraction form
   1,725.50/2,588.27 = 426.98/x
3. Step 3: Cross multiply
   1,725.50x = 2,588.27 × 426.98
4. Step 4: Simplify right side
   1,725.50x = 1,105,139.52
5. Step 5: Solve for x
   x = 1,105,139.52/1,725.50
6. Step 6: Final answer
   x = 640.47