Finding the Fourth Proportional to 82.21, 123.31 and 21.34

Step by Step Solution

1. Step 1: Write the proportion equation
   82.21 : 123.31 = 21.34 : x
2. Step 2: Convert to fraction form
   82.21/123.31 = 21.34/x
3. Step 3: Cross multiply
   82.21x = 123.31 × 21.34
4. Step 4: Simplify right side
   82.21x = 2,631.39
5. Step 5: Solve for x
   x = 2,631.39/82.21
6. Step 6: Final answer
   x = 32.01