Finding the Fourth Proportional to 21,429.43, 32,152.59 and 6,639.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,429.43 : 32,152.59 = 6,639.49 : x
2. Step 2: Convert to fraction form
   21,429.43/32,152.59 = 6,639.49/x
3. Step 3: Cross multiply
   21,429.43x = 32,152.59 × 6,639.49
4. Step 4: Simplify right side
   21,429.43x = 213,476,880.16
5. Step 5: Solve for x
   x = 213,476,880.16/21,429.43
6. Step 6: Final answer
   x = 9,961.86