Finding the Fourth Proportional to 1,550.27, 2,139.32 and 842.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.27 : 2,139.32 = 842.09 : x
2. Step 2: Convert to fraction form
   1,550.27/2,139.32 = 842.09/x
3. Step 3: Cross multiply
   1,550.27x = 2,139.32 × 842.09
4. Step 4: Simplify right side
   1,550.27x = 1,801,492.53
5. Step 5: Solve for x
   x = 1,801,492.53/1,550.27
6. Step 6: Final answer
   x = 1,162.05