Finding the Fourth Proportional to 1,258.30, 1,736.42 and 698.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.30 : 1,736.42 = 698.75 : x
2. Step 2: Convert to fraction form
   1,258.30/1,736.42 = 698.75/x
3. Step 3: Cross multiply
   1,258.30x = 1,736.42 × 698.75
4. Step 4: Simplify right side
   1,258.30x = 1,213,323.48
5. Step 5: Solve for x
   x = 1,213,323.48/1,258.30
6. Step 6: Final answer
   x = 964.26