Finding the Fourth Proportional to 1,128.84, 1,690.83 and 550.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.84 : 1,690.83 = 550.50 : x
2. Step 2: Convert to fraction form
   1,128.84/1,690.83 = 550.50/x
3. Step 3: Cross multiply
   1,128.84x = 1,690.83 × 550.50
4. Step 4: Simplify right side
   1,128.84x = 930,801.92
5. Step 5: Solve for x
   x = 930,801.92/1,128.84
6. Step 6: Final answer
   x = 824.56