Finding the Fourth Proportional to 2,617.79, 3,928.25 and 1,057.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.79 : 3,928.25 = 1,057.58 : x
2. Step 2: Convert to fraction form
   2,617.79/3,928.25 = 1,057.58/x
3. Step 3: Cross multiply
   2,617.79x = 3,928.25 × 1,057.58
4. Step 4: Simplify right side
   2,617.79x = 4,154,433.35
5. Step 5: Solve for x
   x = 4,154,433.35/2,617.79
6. Step 6: Final answer
   x = 1,587.00