Finding the Fourth Proportional to 2,648.72, 3,968.64 and 1,914.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.72 : 3,968.64 = 1,914.56 : x
2. Step 2: Convert to fraction form
   2,648.72/3,968.64 = 1,914.56/x
3. Step 3: Cross multiply
   2,648.72x = 3,968.64 × 1,914.56
4. Step 4: Simplify right side
   2,648.72x = 7,598,199.40
5. Step 5: Solve for x
   x = 7,598,199.40/2,648.72
6. Step 6: Final answer
   x = 2,868.63