Finding the Fourth Proportional to 3,380.60, 5,065.67 and 2,638.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,380.60 : 5,065.67 = 2,638.45 : x
2. Step 2: Convert to fraction form
   3,380.60/5,065.67 = 2,638.45/x
3. Step 3: Cross multiply
   3,380.60x = 5,065.67 × 2,638.45
4. Step 4: Simplify right side
   3,380.60x = 13,365,536.27
5. Step 5: Solve for x
   x = 13,365,536.27/3,380.60
6. Step 6: Final answer
   x = 3,953.60