Finding the Fourth Proportional to 2,648.90, 3,968.85 and 1,605.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.90 : 3,968.85 = 1,605.72 : x
2. Step 2: Convert to fraction form
   2,648.90/3,968.85 = 1,605.72/x
3. Step 3: Cross multiply
   2,648.90x = 3,968.85 × 1,605.72
4. Step 4: Simplify right side
   2,648.90x = 6,372,861.82
5. Step 5: Solve for x
   x = 6,372,861.82/2,648.90
6. Step 6: Final answer
   x = 2,405.86