Finding the Fourth Proportional to 2,617.56, 3,925.87 and 862.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.56 : 3,925.87 = 862.58 : x
2. Step 2: Convert to fraction form
   2,617.56/3,925.87 = 862.58/x
3. Step 3: Cross multiply
   2,617.56x = 3,925.87 × 862.58
4. Step 4: Simplify right side
   2,617.56x = 3,386,384.60
5. Step 5: Solve for x
   x = 3,386,384.60/2,617.56
6. Step 6: Final answer
   x = 1,293.72