Finding the Fourth Proportional to 1,092.20, 1,634.72 and 681.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.20 : 1,634.72 = 681.72 : x
2. Step 2: Convert to fraction form
   1,092.20/1,634.72 = 681.72/x
3. Step 3: Cross multiply
   1,092.20x = 1,634.72 × 681.72
4. Step 4: Simplify right side
   1,092.20x = 1,114,421.32
5. Step 5: Solve for x
   x = 1,114,421.32/1,092.20
6. Step 6: Final answer
   x = 1,020.35