Finding the Fourth Proportional to 2,565.02, 3,539.72 and 1,386.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,565.02 : 3,539.72 = 1,386.09 : x
2. Step 2: Convert to fraction form
   2,565.02/3,539.72 = 1,386.09/x
3. Step 3: Cross multiply
   2,565.02x = 3,539.72 × 1,386.09
4. Step 4: Simplify right side
   2,565.02x = 4,906,370.49
5. Step 5: Solve for x
   x = 4,906,370.49/2,565.02
6. Step 6: Final answer
   x = 1,912.80