Finding the Fourth Proportional to 1,115.88, 1,674.72 and 681.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,115.88 : 1,674.72 = 681.72 : x
2. Step 2: Convert to fraction form
   1,115.88/1,674.72 = 681.72/x
3. Step 3: Cross multiply
   1,115.88x = 1,674.72 × 681.72
4. Step 4: Simplify right side
   1,115.88x = 1,141,690.12
5. Step 5: Solve for x
   x = 1,141,690.12/1,115.88
6. Step 6: Final answer
   x = 1,023.13