Finding the Fourth Proportional to 2,071.37, 3,109.49 and 839.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.37 : 3,109.49 = 839.67 : x
2. Step 2: Convert to fraction form
   2,071.37/3,109.49 = 839.67/x
3. Step 3: Cross multiply
   2,071.37x = 3,109.49 × 839.67
4. Step 4: Simplify right side
   2,071.37x = 2,610,932.76
5. Step 5: Solve for x
   x = 2,610,932.76/2,071.37
6. Step 6: Final answer
   x = 1,260.48