Finding the Fourth Proportional to 1,196.87, 1,644.75 and 986.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.87 : 1,644.75 = 986.67 : x
2. Step 2: Convert to fraction form
   1,196.87/1,644.75 = 986.67/x
3. Step 3: Cross multiply
   1,196.87x = 1,644.75 × 986.67
4. Step 4: Simplify right side
   1,196.87x = 1,622,825.48
5. Step 5: Solve for x
   x = 1,622,825.48/1,196.87
6. Step 6: Final answer
   x = 1,355.90