Finding the Fourth Proportional to 1,258.27, 1,736.43 and 698.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.27 : 1,736.43 = 698.79 : x
2. Step 2: Convert to fraction form
   1,258.27/1,736.43 = 698.79/x
3. Step 3: Cross multiply
   1,258.27x = 1,736.43 × 698.79
4. Step 4: Simplify right side
   1,258.27x = 1,213,393.32
5. Step 5: Solve for x
   x = 1,213,393.32/1,258.27
6. Step 6: Final answer
   x = 964.34