Finding the Fourth Proportional to 21,977.34, 30,328.82 and 11,905.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,977.34 : 30,328.82 = 11,905.89 : x
2. Step 2: Convert to fraction form
   21,977.34/30,328.82 = 11,905.89/x
3. Step 3: Cross multiply
   21,977.34x = 30,328.82 × 11,905.89
4. Step 4: Simplify right side
   21,977.34x = 361,091,594.75
5. Step 5: Solve for x
   x = 361,091,594.75/21,977.34
6. Step 6: Final answer
   x = 16,430.18