Finding the Fourth Proportional to 1,215.92, 1,822.17 and 556.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.92 : 1,822.17 = 556.18 : x
2. Step 2: Convert to fraction form
   1,215.92/1,822.17 = 556.18/x
3. Step 3: Cross multiply
   1,215.92x = 1,822.17 × 556.18
4. Step 4: Simplify right side
   1,215.92x = 1,013,445.40
5. Step 5: Solve for x
   x = 1,013,445.40/1,215.92
6. Step 6: Final answer
   x = 833.48