Finding the Fourth Proportional to 2,073.02, 3,109.83 and 685.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.02 : 3,109.83 = 685.90 : x
2. Step 2: Convert to fraction form
   2,073.02/3,109.83 = 685.90/x
3. Step 3: Cross multiply
   2,073.02x = 3,109.83 × 685.90
4. Step 4: Simplify right side
   2,073.02x = 2,133,032.40
5. Step 5: Solve for x
   x = 2,133,032.40/2,073.02
6. Step 6: Final answer
   x = 1,028.95