Finding the Fourth Proportional to 6,438.42, 8,887.15 and 3,922.15

Step by Step Solution

1. Step 1: Write the proportion equation
   6,438.42 : 8,887.15 = 3,922.15 : x
2. Step 2: Convert to fraction form
   6,438.42/8,887.15 = 3,922.15/x
3. Step 3: Cross multiply
   6,438.42x = 8,887.15 × 3,922.15
4. Step 4: Simplify right side
   6,438.42x = 34,856,735.37
5. Step 5: Solve for x
   x = 34,856,735.37/6,438.42
6. Step 6: Final answer
   x = 5,413.87