Finding the Fourth Proportional to 1,550.50, 2,139.69 and 851.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.50 : 2,139.69 = 851.88 : x
2. Step 2: Convert to fraction form
   1,550.50/2,139.69 = 851.88/x
3. Step 3: Cross multiply
   1,550.50x = 2,139.69 × 851.88
4. Step 4: Simplify right side
   1,550.50x = 1,822,759.12
5. Step 5: Solve for x
   x = 1,822,759.12/1,550.50
6. Step 6: Final answer
   x = 1,175.59