Finding the Fourth Proportional to 1,759.68, 2,426.15 and 1,287.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,759.68 : 2,426.15 = 1,287.20 : x
2. Step 2: Convert to fraction form
   1,759.68/2,426.15 = 1,287.20/x
3. Step 3: Cross multiply
   1,759.68x = 2,426.15 × 1,287.20
4. Step 4: Simplify right side
   1,759.68x = 3,122,928.15
5. Step 5: Solve for x
   x = 3,122,928.15/1,759.68
6. Step 6: Final answer
   x = 1,774.71