Finding the Fourth Proportional to 2,156.62, 3,233.91 and 986.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.62 : 3,233.91 = 986.28 : x
2. Step 2: Convert to fraction form
   2,156.62/3,233.91 = 986.28/x
3. Step 3: Cross multiply
   2,156.62x = 3,233.91 × 986.28
4. Step 4: Simplify right side
   2,156.62x = 3,189,540.75
5. Step 5: Solve for x
   x = 3,189,540.75/2,156.62
6. Step 6: Final answer
   x = 1,478.95