Finding the Fourth Proportional to 882.72, 1,218.72 and 808.72

Step by Step Solution

1. Step 1: Write the proportion equation
   882.72 : 1,218.72 = 808.72 : x
2. Step 2: Convert to fraction form
   882.72/1,218.72 = 808.72/x
3. Step 3: Cross multiply
   882.72x = 1,218.72 × 808.72
4. Step 4: Simplify right side
   882.72x = 985,603.24
5. Step 5: Solve for x
   x = 985,603.24/882.72
6. Step 6: Final answer
   x = 1,116.55