Finding the Fourth Proportional to 1,550.28, 2,139.30 and 851.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.28 : 2,139.30 = 851.56 : x
2. Step 2: Convert to fraction form
   1,550.28/2,139.30 = 851.56/x
3. Step 3: Cross multiply
   1,550.28x = 2,139.30 × 851.56
4. Step 4: Simplify right side
   1,550.28x = 1,821,742.31
5. Step 5: Solve for x
   x = 1,821,742.31/1,550.28
6. Step 6: Final answer
   x = 1,175.11