Finding the Fourth Proportional to 1,550.65, 2,139.88 and 842.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.65 : 2,139.88 = 842.49 : x
2. Step 2: Convert to fraction form
   1,550.65/2,139.88 = 842.49/x
3. Step 3: Cross multiply
   1,550.65x = 2,139.88 × 842.49
4. Step 4: Simplify right side
   1,550.65x = 1,802,827.50
5. Step 5: Solve for x
   x = 1,802,827.50/1,550.65
6. Step 6: Final answer
   x = 1,162.63