Finding the Fourth Proportional to 2,505.28, 3,457.12 and 1,386.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.28 : 3,457.12 = 1,386.27 : x
2. Step 2: Convert to fraction form
   2,505.28/3,457.12 = 1,386.27/x
3. Step 3: Cross multiply
   2,505.28x = 3,457.12 × 1,386.27
4. Step 4: Simplify right side
   2,505.28x = 4,792,501.74
5. Step 5: Solve for x
   x = 4,792,501.74/2,505.28
6. Step 6: Final answer
   x = 1,912.96