Finding the Fourth Proportional to 3,621.33, 5,428.31 and 1,399.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,621.33 : 5,428.31 = 1,399.56 : x
2. Step 2: Convert to fraction form
   3,621.33/5,428.31 = 1,399.56/x
3. Step 3: Cross multiply
   3,621.33x = 5,428.31 × 1,399.56
4. Step 4: Simplify right side
   3,621.33x = 7,597,238.55
5. Step 5: Solve for x
   x = 7,597,238.55/3,621.33
6. Step 6: Final answer
   x = 2,097.91