Finding the Fourth Proportional to 21,322.50, 31,918.13 and 13,911

Step by Step Solution

1. Step 1: Write the proportion equation
   21,322.50 : 31,918.13 = 13,911 : x
2. Step 2: Convert to fraction form
   21,322.50/31,918.13 = 13,911/x
3. Step 3: Cross multiply
   21,322.50x = 31,918.13 × 13,911
4. Step 4: Simplify right side
   21,322.50x = 444,013,106.43
5. Step 5: Solve for x
   x = 444,013,106.43/21,322.50
6. Step 6: Final answer
   x = 20,823.69