Finding the Fourth Proportional to 1,550.51, 2,139.71 and 842.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.51 : 2,139.71 = 842.35 : x
2. Step 2: Convert to fraction form
   1,550.51/2,139.71 = 842.35/x
3. Step 3: Cross multiply
   1,550.51x = 2,139.71 × 842.35
4. Step 4: Simplify right side
   1,550.51x = 1,802,384.72
5. Step 5: Solve for x
   x = 1,802,384.72/1,550.51
6. Step 6: Final answer
   x = 1,162.45