Finding the Fourth Proportional to 1,258.31, 1,736.52 and 691.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.31 : 1,736.52 = 691.17 : x
2. Step 2: Convert to fraction form
   1,258.31/1,736.52 = 691.17/x
3. Step 3: Cross multiply
   1,258.31x = 1,736.52 × 691.17
4. Step 4: Simplify right side
   1,258.31x = 1,200,218.39
5. Step 5: Solve for x
   x = 1,200,218.39/1,258.31
6. Step 6: Final answer
   x = 953.83