Finding the Fourth Proportional to 21,196.50, 29,251.17 and 12,813

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.50 : 29,251.17 = 12,813 : x
2. Step 2: Convert to fraction form
   21,196.50/29,251.17 = 12,813/x
3. Step 3: Cross multiply
   21,196.50x = 29,251.17 × 12,813
4. Step 4: Simplify right side
   21,196.50x = 374,795,241.21
5. Step 5: Solve for x
   x = 374,795,241.21/21,196.50
6. Step 6: Final answer
   x = 17,681.94