Finding the Fourth Proportional to 21,011.00, 31,495.23 and 13,620.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,011.00 : 31,495.23 = 13,620.15 : x
2. Step 2: Convert to fraction form
   21,011.00/31,495.23 = 13,620.15/x
3. Step 3: Cross multiply
   21,011.00x = 31,495.23 × 13,620.15
4. Step 4: Simplify right side
   21,011.00x = 428,969,756.88
5. Step 5: Solve for x
   x = 428,969,756.88/21,011.00
6. Step 6: Final answer
   x = 20,416.44