Finding the Fourth Proportional to 1,216.56, 1,678.88 and 797.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.56 : 1,678.88 = 797.12 : x
2. Step 2: Convert to fraction form
   1,216.56/1,678.88 = 797.12/x
3. Step 3: Cross multiply
   1,216.56x = 1,678.88 × 797.12
4. Step 4: Simplify right side
   1,216.56x = 1,338,268.83
5. Step 5: Solve for x
   x = 1,338,268.83/1,216.56
6. Step 6: Final answer
   x = 1,100.04