Finding the Fourth Proportional to 21,929.20, 32,685.34 and 20,683.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,929.20 : 32,685.34 = 20,683.69 : x
2. Step 2: Convert to fraction form
   21,929.20/32,685.34 = 20,683.69/x
3. Step 3: Cross multiply
   21,929.20x = 32,685.34 × 20,683.69
4. Step 4: Simplify right side
   21,929.20x = 676,053,440.10
5. Step 5: Solve for x
   x = 676,053,440.10/21,929.20
6. Step 6: Final answer
   x = 30,828.91