Finding the Fourth Proportional to 2,662.20, 3,986.55 and 2,415.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.20 : 3,986.55 = 2,415.96 : x
2. Step 2: Convert to fraction form
   2,662.20/3,986.55 = 2,415.96/x
3. Step 3: Cross multiply
   2,662.20x = 3,986.55 × 2,415.96
4. Step 4: Simplify right side
   2,662.20x = 9,631,345.34
5. Step 5: Solve for x
   x = 9,631,345.34/2,662.20
6. Step 6: Final answer
   x = 3,617.81