Finding the Fourth Proportional to 2,636.72, 3,933.44 and 2,565.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.72 : 3,933.44 = 2,565.20 : x
2. Step 2: Convert to fraction form
   2,636.72/3,933.44 = 2,565.20/x
3. Step 3: Cross multiply
   2,636.72x = 3,933.44 × 2,565.20
4. Step 4: Simplify right side
   2,636.72x = 10,090,060.29
5. Step 5: Solve for x
   x = 10,090,060.29/2,636.72
6. Step 6: Final answer
   x = 3,826.75