Finding the Fourth Proportional to 8,212.91, 11,329.86 and 5,379.02

Step by Step Solution

1. Step 1: Write the proportion equation
   8,212.91 : 11,329.86 = 5,379.02 : x
2. Step 2: Convert to fraction form
   8,212.91/11,329.86 = 5,379.02/x
3. Step 3: Cross multiply
   8,212.91x = 11,329.86 × 5,379.02
4. Step 4: Simplify right side
   8,212.91x = 60,943,543.54
5. Step 5: Solve for x
   x = 60,943,543.54/8,212.91
6. Step 6: Final answer
   x = 7,420.46