Finding the Fourth Proportional to 1,259.16, 1,738.71 and 817.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,259.16 : 1,738.71 = 817.58 : x
2. Step 2: Convert to fraction form
   1,259.16/1,738.71 = 817.58/x
3. Step 3: Cross multiply
   1,259.16x = 1,738.71 × 817.58
4. Step 4: Simplify right side
   1,259.16x = 1,421,525.83
5. Step 5: Solve for x
   x = 1,421,525.83/1,259.16
6. Step 6: Final answer
   x = 1,128.95