Finding the Fourth Proportional to 21,321.50, 31,916.63 and 13,910.00

Step by Step Solution

1. Step 1: Write the proportion equation
   21,321.50 : 31,916.63 = 13,910.00 : x
2. Step 2: Convert to fraction form
   21,321.50/31,916.63 = 13,910.00/x
3. Step 3: Cross multiply
   21,321.50x = 31,916.63 × 13,910.00
4. Step 4: Simplify right side
   21,321.50x = 443,960,198.49
5. Step 5: Solve for x
   x = 443,960,198.49/21,321.50
6. Step 6: Final answer
   x = 20,822.19