Finding the Fourth Proportional to 21,779.34, 30,054.90 and 12,218.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,779.34 : 30,054.90 = 12,218.42 : x
2. Step 2: Convert to fraction form
   21,779.34/30,054.90 = 12,218.42/x
3. Step 3: Cross multiply
   21,779.34x = 30,054.90 × 12,218.42
4. Step 4: Simplify right side
   21,779.34x = 367,223,391.26
5. Step 5: Solve for x
   x = 367,223,391.26/21,779.34
6. Step 6: Final answer
   x = 16,861.09