Finding the Fourth Proportional to 1,258.56, 1,736.73 and 698.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.56 : 1,736.73 = 698.99 : x
2. Step 2: Convert to fraction form
   1,258.56/1,736.73 = 698.99/x
3. Step 3: Cross multiply
   1,258.56x = 1,736.73 × 698.99
4. Step 4: Simplify right side
   1,258.56x = 1,213,948.22
5. Step 5: Solve for x
   x = 1,213,948.22/1,258.56
6. Step 6: Final answer
   x = 964.55