Finding the Fourth Proportional to 9,007.21, 12,429.43 and 5,028.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,007.21 : 12,429.43 = 5,028.57 : x
2. Step 2: Convert to fraction form
   9,007.21/12,429.43 = 5,028.57/x
3. Step 3: Cross multiply
   9,007.21x = 12,429.43 × 5,028.57
4. Step 4: Simplify right side
   9,007.21x = 62,502,289.89
5. Step 5: Solve for x
   x = 62,502,289.89/9,007.21
6. Step 6: Final answer
   x = 6,939.14