Finding the Fourth Proportional to 6,424.29, 8,868.25 and 3,907.21

Step by Step Solution

1. Step 1: Write the proportion equation
   6,424.29 : 8,868.25 = 3,907.21 : x
2. Step 2: Convert to fraction form
   6,424.29/8,868.25 = 3,907.21/x
3. Step 3: Cross multiply
   6,424.29x = 8,868.25 × 3,907.21
4. Step 4: Simplify right side
   6,424.29x = 34,650,065.86
5. Step 5: Solve for x
   x = 34,650,065.86/6,424.29
6. Step 6: Final answer
   x = 5,393.60