Finding the Fourth Proportional to 2,615.48, 3,919.56 and 1,965.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.48 : 3,919.56 = 1,965.80 : x
2. Step 2: Convert to fraction form
   2,615.48/3,919.56 = 1,965.80/x
3. Step 3: Cross multiply
   2,615.48x = 3,919.56 × 1,965.80
4. Step 4: Simplify right side
   2,615.48x = 7,705,071.05
5. Step 5: Solve for x
   x = 7,705,071.05/2,615.48
6. Step 6: Final answer
   x = 2,945.95