Finding the Fourth Proportional to 21,978.82, 30,330.83 and 11,907.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.82 : 30,330.83 = 11,907.23 : x
2. Step 2: Convert to fraction form
   21,978.82/30,330.83 = 11,907.23/x
3. Step 3: Cross multiply
   21,978.82x = 30,330.83 × 11,907.23
4. Step 4: Simplify right side
   21,978.82x = 361,156,168.90
5. Step 5: Solve for x
   x = 361,156,168.90/21,978.82
6. Step 6: Final answer
   x = 16,432.01