Finding the Fourth Proportional to 2,071.63, 3,108.03 and 685.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.63 : 3,108.03 = 685.09 : x
2. Step 2: Convert to fraction form
   2,071.63/3,108.03 = 685.09/x
3. Step 3: Cross multiply
   2,071.63x = 3,108.03 × 685.09
4. Step 4: Simplify right side
   2,071.63x = 2,129,280.27
5. Step 5: Solve for x
   x = 2,129,280.27/2,071.63
6. Step 6: Final answer
   x = 1,027.83