Finding the Fourth Proportional to 1,550.30, 2,139.39 and 851.66

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.30 : 2,139.39 = 851.66 : x
2. Step 2: Convert to fraction form
   1,550.30/2,139.39 = 851.66/x
3. Step 3: Cross multiply
   1,550.30x = 2,139.39 × 851.66
4. Step 4: Simplify right side
   1,550.30x = 1,822,032.89
5. Step 5: Solve for x
   x = 1,822,032.89/1,550.30
6. Step 6: Final answer
   x = 1,175.28