Finding the Fourth Proportional to 9,405.38, 12,979.86 and 5,213.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.38 : 12,979.86 = 5,213.72 : x
2. Step 2: Convert to fraction form
   9,405.38/12,979.86 = 5,213.72/x
3. Step 3: Cross multiply
   9,405.38x = 12,979.86 × 5,213.72
4. Step 4: Simplify right side
   9,405.38x = 67,673,355.68
5. Step 5: Solve for x
   x = 67,673,355.68/9,405.38
6. Step 6: Final answer
   x = 7,195.18