Finding the Fourth Proportional to 3,933.72, 5,428.33 and 2,165.00

Step by Step Solution

1. Step 1: Write the proportion equation
   3,933.72 : 5,428.33 = 2,165.00 : x
2. Step 2: Convert to fraction form
   3,933.72/5,428.33 = 2,165.00/x
3. Step 3: Cross multiply
   3,933.72x = 5,428.33 × 2,165.00
4. Step 4: Simplify right side
   3,933.72x = 11,752,301.90
5. Step 5: Solve for x
   x = 11,752,301.90/3,933.72
6. Step 6: Final answer
   x = 2,987.58