Finding the Fourth Proportional to 3,933.59, 5,428.32 and 2,165.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,933.59 : 5,428.32 = 2,165.22 : x
2. Step 2: Convert to fraction form
   3,933.59/5,428.32 = 2,165.22/x
3. Step 3: Cross multiply
   3,933.59x = 5,428.32 × 2,165.22
4. Step 4: Simplify right side
   3,933.59x = 11,753,507.03
5. Step 5: Solve for x
   x = 11,753,507.03/3,933.59
6. Step 6: Final answer
   x = 2,987.99