Finding the Fourth Proportional to 1,288.88, 1,932.72 and 558.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.88 : 1,932.72 = 558.24 : x
2. Step 2: Convert to fraction form
   1,288.88/1,932.72 = 558.24/x
3. Step 3: Cross multiply
   1,288.88x = 1,932.72 × 558.24
4. Step 4: Simplify right side
   1,288.88x = 1,078,921.61
5. Step 5: Solve for x
   x = 1,078,921.61/1,288.88
6. Step 6: Final answer
   x = 837.10