Finding the Fourth Proportional to 2,111.70, 3,167.70 and 650.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.70 : 3,167.70 = 650.85 : x
2. Step 2: Convert to fraction form
   2,111.70/3,167.70 = 650.85/x
3. Step 3: Cross multiply
   2,111.70x = 3,167.70 × 650.85
4. Step 4: Simplify right side
   2,111.70x = 2,061,697.55
5. Step 5: Solve for x
   x = 2,061,697.55/2,111.70
6. Step 6: Final answer
   x = 976.32