Finding the Fourth Proportional to 2,615.16, 3,610.80 and 2,120.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.16 : 3,610.80 = 2,120.04 : x
2. Step 2: Convert to fraction form
   2,615.16/3,610.80 = 2,120.04/x
3. Step 3: Cross multiply
   2,615.16x = 3,610.80 × 2,120.04
4. Step 4: Simplify right side
   2,615.16x = 7,655,040.43
5. Step 5: Solve for x
   x = 7,655,040.43/2,615.16
6. Step 6: Final answer
   x = 2,927.18