Finding the Fourth Proportional to 2,565.20, 3,539.98 and 1,386.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,565.20 : 3,539.98 = 1,386.27 : x
2. Step 2: Convert to fraction form
   2,565.20/3,539.98 = 1,386.27/x
3. Step 3: Cross multiply
   2,565.20x = 3,539.98 × 1,386.27
4. Step 4: Simplify right side
   2,565.20x = 4,907,368.07
5. Step 5: Solve for x
   x = 4,907,368.07/2,565.20
6. Step 6: Final answer
   x = 1,913.05