Finding the Fourth Proportional to 2,587.68, 3,880.61 and 832.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.68 : 3,880.61 = 832.61 : x
2. Step 2: Convert to fraction form
   2,587.68/3,880.61 = 832.61/x
3. Step 3: Cross multiply
   2,587.68x = 3,880.61 × 832.61
4. Step 4: Simplify right side
   2,587.68x = 3,231,043.35
5. Step 5: Solve for x
   x = 3,231,043.35/2,587.68
6. Step 6: Final answer
   x = 1,248.63