Finding the Fourth Proportional to 21,021, 31,536.50 and 7,170

Step by Step Solution

1. Step 1: Write the proportion equation
   21,021 : 31,536.50 = 7,170 : x
2. Step 2: Convert to fraction form
   21,021/31,536.50 = 7,170/x
3. Step 3: Cross multiply
   21,021x = 31,536.50 × 7,170
4. Step 4: Simplify right side
   21,021x = 226,116,669.15
5. Step 5: Solve for x
   x = 226,116,669.15/21,021
6. Step 6: Final answer
   x = 10,756.70