Finding the Fourth Proportional to 1,258.38, 1,736.69 and 698.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.38 : 1,736.69 = 698.88 : x
2. Step 2: Convert to fraction form
   1,258.38/1,736.69 = 698.88/x
3. Step 3: Cross multiply
   1,258.38x = 1,736.69 × 698.88
4. Step 4: Simplify right side
   1,258.38x = 1,213,737.91
5. Step 5: Solve for x
   x = 1,213,737.91/1,258.38
6. Step 6: Final answer
   x = 964.52