Finding the Fourth Proportional to 1,229.75, 1,697.59 and 856.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,229.75 : 1,697.59 = 856.59 : x
2. Step 2: Convert to fraction form
   1,229.75/1,697.59 = 856.59/x
3. Step 3: Cross multiply
   1,229.75x = 1,697.59 × 856.59
4. Step 4: Simplify right side
   1,229.75x = 1,454,133.32
5. Step 5: Solve for x
   x = 1,454,133.32/1,229.75
6. Step 6: Final answer
   x = 1,182.46