Finding the Fourth Proportional to 1,258.50, 1,736.73 and 698.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.50 : 1,736.73 = 698.98 : x
2. Step 2: Convert to fraction form
   1,258.50/1,736.73 = 698.98/x
3. Step 3: Cross multiply
   1,258.50x = 1,736.73 × 698.98
4. Step 4: Simplify right side
   1,258.50x = 1,213,939.54
5. Step 5: Solve for x
   x = 1,213,939.54/1,258.50
6. Step 6: Final answer
   x = 964.59