Finding the Fourth Proportional to 9,415.43, 12,993.30 and 5,223.68

Step by Step Solution

1. Step 1: Write the proportion equation
   9,415.43 : 12,993.30 = 5,223.68 : x
2. Step 2: Convert to fraction form
   9,415.43/12,993.30 = 5,223.68/x
3. Step 3: Cross multiply
   9,415.43x = 12,993.30 × 5,223.68
4. Step 4: Simplify right side
   9,415.43x = 67,872,841.34
5. Step 5: Solve for x
   x = 67,872,841.34/9,415.43
6. Step 6: Final answer
   x = 7,208.68