Finding the Fourth Proportional to 2,587.72, 3,880.38 and 832.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.72 : 3,880.38 = 832.40 : x
2. Step 2: Convert to fraction form
   2,587.72/3,880.38 = 832.40/x
3. Step 3: Cross multiply
   2,587.72x = 3,880.38 × 832.40
4. Step 4: Simplify right side
   2,587.72x = 3,230,008.91
5. Step 5: Solve for x
   x = 3,230,008.91/2,587.72
6. Step 6: Final answer
   x = 1,248.21