Finding the Fourth Proportional to 8,217.86, 12,338.83 and 5,415.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,217.86 : 12,338.83 = 5,415.05 : x
2. Step 2: Convert to fraction form
   8,217.86/12,338.83 = 5,415.05/x
3. Step 3: Cross multiply
   8,217.86x = 12,338.83 × 5,415.05
4. Step 4: Simplify right side
   8,217.86x = 66,815,419.01
5. Step 5: Solve for x
   x = 66,815,419.01/8,217.86
6. Step 6: Final answer
   x = 8,130.52