Finding the Fourth Proportional to 8,422.32, 11,622.82 and 5,065.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,422.32 : 11,622.82 = 5,065.20 : x
2. Step 2: Convert to fraction form
   8,422.32/11,622.82 = 5,065.20/x
3. Step 3: Cross multiply
   8,422.32x = 11,622.82 × 5,065.20
4. Step 4: Simplify right side
   8,422.32x = 58,871,907.86
5. Step 5: Solve for x
   x = 58,871,907.86/8,422.32
6. Step 6: Final answer
   x = 6,989.99