Finding the Fourth Proportional to 1,085.74, 1,628.13 and 674.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.74 : 1,628.13 = 674.86 : x
2. Step 2: Convert to fraction form
   1,085.74/1,628.13 = 674.86/x
3. Step 3: Cross multiply
   1,085.74x = 1,628.13 × 674.86
4. Step 4: Simplify right side
   1,085.74x = 1,098,759.81
5. Step 5: Solve for x
   x = 1,098,759.81/1,085.74
6. Step 6: Final answer
   x = 1,011.99