Finding the Fourth Proportional to 1,288.86, 1,933.37 and 558.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.86 : 1,933.37 = 558.50 : x
2. Step 2: Convert to fraction form
   1,288.86/1,933.37 = 558.50/x
3. Step 3: Cross multiply
   1,288.86x = 1,933.37 × 558.50
4. Step 4: Simplify right side
   1,288.86x = 1,079,776.78
5. Step 5: Solve for x
   x = 1,079,776.78/1,288.86
6. Step 6: Final answer
   x = 837.78