Finding the Fourth Proportional to 1,308.35, 1,961.31 and 658.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.35 : 1,961.31 = 658.33 : x
2. Step 2: Convert to fraction form
   1,308.35/1,961.31 = 658.33/x
3. Step 3: Cross multiply
   1,308.35x = 1,961.31 × 658.33
4. Step 4: Simplify right side
   1,308.35x = 1,291,186.78
5. Step 5: Solve for x
   x = 1,291,186.78/1,308.35
6. Step 6: Final answer
   x = 986.88