Finding the Fourth Proportional to 2,665.20, 3,991.62 and 2,572.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.20 : 3,991.62 = 2,572.92 : x
2. Step 2: Convert to fraction form
   2,665.20/3,991.62 = 2,572.92/x
3. Step 3: Cross multiply
   2,665.20x = 3,991.62 × 2,572.92
4. Step 4: Simplify right side
   2,665.20x = 10,270,118.93
5. Step 5: Solve for x
   x = 10,270,118.93/2,665.20
6. Step 6: Final answer
   x = 3,853.41