Finding the Fourth Proportional to 1,078.42, 1,616.82 and 557.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.42 : 1,616.82 = 557.72 : x
2. Step 2: Convert to fraction form
   1,078.42/1,616.82 = 557.72/x
3. Step 3: Cross multiply
   1,078.42x = 1,616.82 × 557.72
4. Step 4: Simplify right side
   1,078.42x = 901,734.80
5. Step 5: Solve for x
   x = 901,734.80/1,078.42
6. Step 6: Final answer
   x = 836.16