Finding the Fourth Proportional to 9,389.86, 12,957.12 and 5,612.27

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.86 : 12,957.12 = 5,612.27 : x
2. Step 2: Convert to fraction form
   9,389.86/12,957.12 = 5,612.27/x
3. Step 3: Cross multiply
   9,389.86x = 12,957.12 × 5,612.27
4. Step 4: Simplify right side
   9,389.86x = 72,718,839.67
5. Step 5: Solve for x
   x = 72,718,839.67/9,389.86
6. Step 6: Final answer
   x = 7,744.40