Finding the Fourth Proportional to 21,018.18, 31,500.62 and 20,795.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.18 : 31,500.62 = 20,795.72 : x
2. Step 2: Convert to fraction form
   21,018.18/31,500.62 = 20,795.72/x
3. Step 3: Cross multiply
   21,018.18x = 31,500.62 × 20,795.72
4. Step 4: Simplify right side
   21,018.18x = 655,078,060.05
5. Step 5: Solve for x
   x = 655,078,060.05/21,018.18
6. Step 6: Final answer
   x = 31,167.21