Finding the Fourth Proportional to 3,665.28, 5,491.70 and 2,619.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.28 : 5,491.70 = 2,619.96 : x
2. Step 2: Convert to fraction form
   3,665.28/5,491.70 = 2,619.96/x
3. Step 3: Cross multiply
   3,665.28x = 5,491.70 × 2,619.96
4. Step 4: Simplify right side
   3,665.28x = 14,388,034.33
5. Step 5: Solve for x
   x = 14,388,034.33/3,665.28
6. Step 6: Final answer
   x = 3,925.49