Finding the Fourth Proportional to 9,057.05, 12,498.78 and 5,078.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.05 : 12,498.78 = 5,078.22 : x
2. Step 2: Convert to fraction form
   9,057.05/12,498.78 = 5,078.22/x
3. Step 3: Cross multiply
   9,057.05x = 12,498.78 × 5,078.22
4. Step 4: Simplify right side
   9,057.05x = 63,471,554.57
5. Step 5: Solve for x
   x = 63,471,554.57/9,057.05
6. Step 6: Final answer
   x = 7,007.98