Finding the Fourth Proportional to 3,465.28, 5,199.72 and 2,648.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,465.28 : 5,199.72 = 2,648.80 : x
2. Step 2: Convert to fraction form
   3,465.28/5,199.72 = 2,648.80/x
3. Step 3: Cross multiply
   3,465.28x = 5,199.72 × 2,648.80
4. Step 4: Simplify right side
   3,465.28x = 13,773,018.34
5. Step 5: Solve for x
   x = 13,773,018.34/3,465.28
6. Step 6: Final answer
   x = 3,974.58