Finding the Fourth Proportional to 2,615.90, 3,606.22 and 2,215.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.90 : 3,606.22 = 2,215.96 : x
2. Step 2: Convert to fraction form
   2,615.90/3,606.22 = 2,215.96/x
3. Step 3: Cross multiply
   2,615.90x = 3,606.22 × 2,215.96
4. Step 4: Simplify right side
   2,615.90x = 7,991,233.03
5. Step 5: Solve for x
   x = 7,991,233.03/2,615.90
6. Step 6: Final answer
   x = 3,054.88