Finding the Fourth Proportional to 3,407.72, 5,111.53 and 909.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,407.72 : 5,111.53 = 909.15 : x
2. Step 2: Convert to fraction form
   3,407.72/5,111.53 = 909.15/x
3. Step 3: Cross multiply
   3,407.72x = 5,111.53 × 909.15
4. Step 4: Simplify right side
   3,407.72x = 4,647,142.99
5. Step 5: Solve for x
   x = 4,647,142.99/3,407.72
6. Step 6: Final answer
   x = 1,363.71