Finding the Fourth Proportional to 2,664.72, 3,995.64 and 909.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,664.72 : 3,995.64 = 909.18 : x
2. Step 2: Convert to fraction form
   2,664.72/3,995.64 = 909.18/x
3. Step 3: Cross multiply
   2,664.72x = 3,995.64 × 909.18
4. Step 4: Simplify right side
   2,664.72x = 3,632,755.98
5. Step 5: Solve for x
   x = 3,632,755.98/2,664.72
6. Step 6: Final answer
   x = 1,363.28