Finding the Fourth Proportional to 21,978.06, 30,329.73 and 11,906.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.06 : 30,329.73 = 11,906.43 : x
2. Step 2: Convert to fraction form
   21,978.06/30,329.73 = 11,906.43/x
3. Step 3: Cross multiply
   21,978.06x = 30,329.73 × 11,906.43
4. Step 4: Simplify right side
   21,978.06x = 361,118,807.16
5. Step 5: Solve for x
   x = 361,118,807.16/21,978.06
6. Step 6: Final answer
   x = 16,430.88