Finding the Fourth Proportional to 1,218.72, 1,682.60 and 799.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218.72 : 1,682.60 = 799.68 : x
2. Step 2: Convert to fraction form
   1,218.72/1,682.60 = 799.68/x
3. Step 3: Cross multiply
   1,218.72x = 1,682.60 × 799.68
4. Step 4: Simplify right side
   1,218.72x = 1,345,541.57
5. Step 5: Solve for x
   x = 1,345,541.57/1,218.72
6. Step 6: Final answer
   x = 1,104.06