Finding the Fourth Proportional to 8,200.86, 12,290.90 and 5,238.17

Step by Step Solution

1. Step 1: Write the proportion equation
   8,200.86 : 12,290.90 = 5,238.17 : x
2. Step 2: Convert to fraction form
   8,200.86/12,290.90 = 5,238.17/x
3. Step 3: Cross multiply
   8,200.86x = 12,290.90 × 5,238.17
4. Step 4: Simplify right side
   8,200.86x = 64,381,775.29
5. Step 5: Solve for x
   x = 64,381,775.29/8,200.86
6. Step 6: Final answer
   x = 7,850.61