Finding the Fourth Proportional to 9,415.38, 12,993.83 and 5,223.63

Step by Step Solution

1. Step 1: Write the proportion equation
   9,415.38 : 12,993.83 = 5,223.63 : x
2. Step 2: Convert to fraction form
   9,415.38/12,993.83 = 5,223.63/x
3. Step 3: Cross multiply
   9,415.38x = 12,993.83 × 5,223.63
4. Step 4: Simplify right side
   9,415.38x = 67,874,960.20
5. Step 5: Solve for x
   x = 67,874,960.20/9,415.38
6. Step 6: Final answer
   x = 7,208.95