Finding the Fourth Proportional to 9,005.57, 12,428.39 and 5,229.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,005.57 : 12,428.39 = 5,229.92 : x
2. Step 2: Convert to fraction form
   9,005.57/12,428.39 = 5,229.92/x
3. Step 3: Cross multiply
   9,005.57x = 12,428.39 × 5,229.92
4. Step 4: Simplify right side
   9,005.57x = 64,999,485.43
5. Step 5: Solve for x
   x = 64,999,485.43/9,005.57
6. Step 6: Final answer
   x = 7,217.70