Finding the Fourth Proportional to 2,116.78, 3,175.05 and 656.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.78 : 3,175.05 = 656.05 : x
2. Step 2: Convert to fraction form
   2,116.78/3,175.05 = 656.05/x
3. Step 3: Cross multiply
   2,116.78x = 3,175.05 × 656.05
4. Step 4: Simplify right side
   2,116.78x = 2,082,991.55
5. Step 5: Solve for x
   x = 2,082,991.55/2,116.78
6. Step 6: Final answer
   x = 984.04