Finding the Fourth Proportional to 21.83, 32.51 and 21.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21.83 : 32.51 = 21.10 : x
2. Step 2: Convert to fraction form
   21.83/32.51 = 21.10/x
3. Step 3: Cross multiply
   21.83x = 32.51 × 21.10
4. Step 4: Simplify right side
   21.83x = 685.69
5. Step 5: Solve for x
   x = 685.69/21.83
6. Step 6: Final answer
   x = 31.42