Finding the Fourth Proportional to 1,085.31, 1,628.51 and 674.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.31 : 1,628.51 = 674.35 : x
2. Step 2: Convert to fraction form
   1,085.31/1,628.51 = 674.35/x
3. Step 3: Cross multiply
   1,085.31x = 1,628.51 × 674.35
4. Step 4: Simplify right side
   1,085.31x = 1,098,178.28
5. Step 5: Solve for x
   x = 1,098,178.28/1,085.31
6. Step 6: Final answer
   x = 1,011.86