Finding the Fourth Proportional to 2,259.90, 3,118.39 and 1,265.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,259.90 : 3,118.39 = 1,265.10 : x
2. Step 2: Convert to fraction form
   2,259.90/3,118.39 = 1,265.10/x
3. Step 3: Cross multiply
   2,259.90x = 3,118.39 × 1,265.10
4. Step 4: Simplify right side
   2,259.90x = 3,945,075.19
5. Step 5: Solve for x
   x = 3,945,075.19/2,259.90
6. Step 6: Final answer
   x = 1,745.69