Finding the Fourth Proportional to 2,111.50, 3,167.70 and 650.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.50 : 3,167.70 = 650.80 : x
2. Step 2: Convert to fraction form
   2,111.50/3,167.70 = 650.80/x
3. Step 3: Cross multiply
   2,111.50x = 3,167.70 × 650.80
4. Step 4: Simplify right side
   2,111.50x = 2,061,539.16
5. Step 5: Solve for x
   x = 2,061,539.16/2,111.50
6. Step 6: Final answer
   x = 976.34