Finding the Fourth Proportional to 2,071.24, 3,107.34 and 839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.24 : 3,107.34 = 839.50 : x
2. Step 2: Convert to fraction form
   2,071.24/3,107.34 = 839.50/x
3. Step 3: Cross multiply
   2,071.24x = 3,107.34 × 839.50
4. Step 4: Simplify right side
   2,071.24x = 2,608,604.16
5. Step 5: Solve for x
   x = 2,608,604.16/2,071.24
6. Step 6: Final answer
   x = 1,259.44