Finding the Fourth Proportional to 1,762.89, 2,640.79 and 839.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,762.89 : 2,640.79 = 839.34 : x
2. Step 2: Convert to fraction form
   1,762.89/2,640.79 = 839.34/x
3. Step 3: Cross multiply
   1,762.89x = 2,640.79 × 839.34
4. Step 4: Simplify right side
   1,762.89x = 2,216,520.68
5. Step 5: Solve for x
   x = 2,216,520.68/1,762.89
6. Step 6: Final answer
   x = 1,257.32