Finding the Fourth Proportional to 21,895, 30,216.72 and 12,466.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,895 : 30,216.72 = 12,466.60 : x
2. Step 2: Convert to fraction form
   21,895/30,216.72 = 12,466.60/x
3. Step 3: Cross multiply
   21,895x = 30,216.72 × 12,466.60
4. Step 4: Simplify right side
   21,895x = 376,699,761.55
5. Step 5: Solve for x
   x = 376,699,761.55/21,895
6. Step 6: Final answer
   x = 17,204.83