Finding the Fourth Proportional to 2,648.60, 3,969.30 and 1,768.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.60 : 3,969.30 = 1,768.60 : x
2. Step 2: Convert to fraction form
   2,648.60/3,969.30 = 1,768.60/x
3. Step 3: Cross multiply
   2,648.60x = 3,969.30 × 1,768.60
4. Step 4: Simplify right side
   2,648.60x = 7,020,103.98
5. Step 5: Solve for x
   x = 7,020,103.98/2,648.60
6. Step 6: Final answer
   x = 2,650.50