Finding the Fourth Proportional to 2,642.55, 3,638.39 and 2,011.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.55 : 3,638.39 = 2,011.05 : x
2. Step 2: Convert to fraction form
   2,642.55/3,638.39 = 2,011.05/x
3. Step 3: Cross multiply
   2,642.55x = 3,638.39 × 2,011.05
4. Step 4: Simplify right side
   2,642.55x = 7,317,001.36
5. Step 5: Solve for x
   x = 7,317,001.36/2,642.55
6. Step 6: Final answer
   x = 2,768.92