Finding the Fourth Proportional to 1,289.62, 1,932.99 and 558.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,289.62 : 1,932.99 = 558.10 : x
2. Step 2: Convert to fraction form
   1,289.62/1,932.99 = 558.10/x
3. Step 3: Cross multiply
   1,289.62x = 1,932.99 × 558.10
4. Step 4: Simplify right side
   1,289.62x = 1,078,801.72
5. Step 5: Solve for x
   x = 1,078,801.72/1,289.62
6. Step 6: Final answer
   x = 836.53