Finding the Fourth Proportional to 1,111.22, 1,665.24 and 879.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.22 : 1,665.24 = 879.08 : x
2. Step 2: Convert to fraction form
   1,111.22/1,665.24 = 879.08/x
3. Step 3: Cross multiply
   1,111.22x = 1,665.24 × 879.08
4. Step 4: Simplify right side
   1,111.22x = 1,463,879.18
5. Step 5: Solve for x
   x = 1,463,879.18/1,111.22
6. Step 6: Final answer
   x = 1,317.36