Finding the Fourth Proportional to 21,906.50, 30,288.58 and 20,927.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,906.50 : 30,288.58 = 20,927.30 : x
2. Step 2: Convert to fraction form
   21,906.50/30,288.58 = 20,927.30/x
3. Step 3: Cross multiply
   21,906.50x = 30,288.58 × 20,927.30
4. Step 4: Simplify right side
   21,906.50x = 633,858,200.23
5. Step 5: Solve for x
   x = 633,858,200.23/21,906.50
6. Step 6: Final answer
   x = 28,934.71