Finding the Fourth Proportional to 1,288.94, 1,934.33 and 558.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.94 : 1,934.33 = 558.72 : x
2. Step 2: Convert to fraction form
   1,288.94/1,934.33 = 558.72/x
3. Step 3: Cross multiply
   1,288.94x = 1,934.33 × 558.72
4. Step 4: Simplify right side
   1,288.94x = 1,080,746.06
5. Step 5: Solve for x
   x = 1,080,746.06/1,288.94
6. Step 6: Final answer
   x = 838.48