Finding the Fourth Proportional to 1,550.29, 2,139.35 and 842.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.29 : 2,139.35 = 842.10 : x
2. Step 2: Convert to fraction form
   1,550.29/2,139.35 = 842.10/x
3. Step 3: Cross multiply
   1,550.29x = 2,139.35 × 842.10
4. Step 4: Simplify right side
   1,550.29x = 1,801,548.74
5. Step 5: Solve for x
   x = 1,801,548.74/1,550.29
6. Step 6: Final answer
   x = 1,162.07