Finding the Fourth Proportional to 2,505.12, 3,457.20 and 1,386.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.12 : 3,457.20 = 1,386.24 : x
2. Step 2: Convert to fraction form
   2,505.12/3,457.20 = 1,386.24/x
3. Step 3: Cross multiply
   2,505.12x = 3,457.20 × 1,386.24
4. Step 4: Simplify right side
   2,505.12x = 4,792,508.93
5. Step 5: Solve for x
   x = 4,792,508.93/2,505.12
6. Step 6: Final answer
   x = 1,913.09