Finding the Fourth Proportional to 9,007.31, 12,429.88 and 5,028.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,007.31 : 12,429.88 = 5,028.79 : x
2. Step 2: Convert to fraction form
   9,007.31/12,429.88 = 5,028.79/x
3. Step 3: Cross multiply
   9,007.31x = 12,429.88 × 5,028.79
4. Step 4: Simplify right side
   9,007.31x = 62,507,256.25
5. Step 5: Solve for x
   x = 62,507,256.25/9,007.31
6. Step 6: Final answer
   x = 6,939.61