Finding the Fourth Proportional to 1,258.61, 1,736.82 and 699.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.61 : 1,736.82 = 699.06 : x
2. Step 2: Convert to fraction form
   1,258.61/1,736.82 = 699.06/x
3. Step 3: Cross multiply
   1,258.61x = 1,736.82 × 699.06
4. Step 4: Simplify right side
   1,258.61x = 1,214,131.28
5. Step 5: Solve for x
   x = 1,214,131.28/1,258.61
6. Step 6: Final answer
   x = 964.66