Finding the Fourth Proportional to 1,401.85, 1,934.65 and 842.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.85 : 1,934.65 = 842.31 : x
2. Step 2: Convert to fraction form
   1,401.85/1,934.65 = 842.31/x
3. Step 3: Cross multiply
   1,401.85x = 1,934.65 × 842.31
4. Step 4: Simplify right side
   1,401.85x = 1,629,576.09
5. Step 5: Solve for x
   x = 1,629,576.09/1,401.85
6. Step 6: Final answer
   x = 1,162.45