Finding the Fourth Proportional to 1,012.82, 1,394.89 and 872.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.82 : 1,394.89 = 872.88 : x
2. Step 2: Convert to fraction form
   1,012.82/1,394.89 = 872.88/x
3. Step 3: Cross multiply
   1,012.82x = 1,394.89 × 872.88
4. Step 4: Simplify right side
   1,012.82x = 1,217,569.40
5. Step 5: Solve for x
   x = 1,217,569.40/1,012.82
6. Step 6: Final answer
   x = 1,202.16