Finding the Fourth Proportional to 21,613.50, 32,429.97 and 12,379.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,613.50 : 32,429.97 = 12,379.50 : x
2. Step 2: Convert to fraction form
   21,613.50/32,429.97 = 12,379.50/x
3. Step 3: Cross multiply
   21,613.50x = 32,429.97 × 12,379.50
4. Step 4: Simplify right side
   21,613.50x = 401,466,813.62
5. Step 5: Solve for x
   x = 401,466,813.62/21,613.50
6. Step 6: Final answer
   x = 18,574.82