Finding the Fourth Proportional to 2,505.16, 3,456.96 and 1,386.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.16 : 3,456.96 = 1,386.16 : x
2. Step 2: Convert to fraction form
   2,505.16/3,456.96 = 1,386.16/x
3. Step 3: Cross multiply
   2,505.16x = 3,456.96 × 1,386.16
4. Step 4: Simplify right side
   2,505.16x = 4,791,899.67
5. Step 5: Solve for x
   x = 4,791,899.67/2,505.16
6. Step 6: Final answer
   x = 1,912.81