Finding the Fourth Proportional to 2,505.38, 3,457.20 and 1,386.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.38 : 3,457.20 = 1,386.32 : x
2. Step 2: Convert to fraction form
   2,505.38/3,457.20 = 1,386.32/x
3. Step 3: Cross multiply
   2,505.38x = 3,457.20 × 1,386.32
4. Step 4: Simplify right side
   2,505.38x = 4,792,773.42
5. Step 5: Solve for x
   x = 4,792,773.42/2,505.38
6. Step 6: Final answer
   x = 1,912.99