Finding the Fourth Proportional to 21,062.09, 31,401.50 and 18,695.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,062.09 : 31,401.50 = 18,695.50 : x
2. Step 2: Convert to fraction form
   21,062.09/31,401.50 = 18,695.50/x
3. Step 3: Cross multiply
   21,062.09x = 31,401.50 × 18,695.50
4. Step 4: Simplify right side
   21,062.09x = 587,066,571.27
5. Step 5: Solve for x
   x = 587,066,571.27/21,062.09
6. Step 6: Final answer
   x = 27,873.14