Finding the Fourth Proportional to 3,665.34, 5,494.20 and 1,815.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.34 : 5,494.20 = 1,815.30 : x
2. Step 2: Convert to fraction form
   3,665.34/5,494.20 = 1,815.30/x
3. Step 3: Cross multiply
   3,665.34x = 5,494.20 × 1,815.30
4. Step 4: Simplify right side
   3,665.34x = 9,973,621.26
5. Step 5: Solve for x
   x = 9,973,621.26/3,665.34
6. Step 6: Final answer
   x = 2,721.06