Finding the Fourth Proportional to 2,617.76, 3,925.61 and 1,057.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.76 : 3,925.61 = 1,057.47 : x
2. Step 2: Convert to fraction form
   2,617.76/3,925.61 = 1,057.47/x
3. Step 3: Cross multiply
   2,617.76x = 3,925.61 × 1,057.47
4. Step 4: Simplify right side
   2,617.76x = 4,151,214.81
5. Step 5: Solve for x
   x = 4,151,214.81/2,617.76
6. Step 6: Final answer
   x = 1,585.79