Finding the Fourth Proportional to 1,687.02, 2,532.90 and 865.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.02 : 2,532.90 = 865.89 : x
2. Step 2: Convert to fraction form
   1,687.02/2,532.90 = 865.89/x
3. Step 3: Cross multiply
   1,687.02x = 2,532.90 × 865.89
4. Step 4: Simplify right side
   1,687.02x = 2,193,212.78
5. Step 5: Solve for x
   x = 2,193,212.78/1,687.02
6. Step 6: Final answer
   x = 1,300.05