Finding the Fourth Proportional to 1,550.39, 2,139.53 and 842.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.39 : 2,139.53 = 842.25 : x
2. Step 2: Convert to fraction form
   1,550.39/2,139.53 = 842.25/x
3. Step 3: Cross multiply
   1,550.39x = 2,139.53 × 842.25
4. Step 4: Simplify right side
   1,550.39x = 1,802,019.14
5. Step 5: Solve for x
   x = 1,802,019.14/1,550.39
6. Step 6: Final answer
   x = 1,162.30