Finding the Fourth Proportional to 82.47, 123.71 and 21.60

Step by Step Solution

1. Step 1: Write the proportion equation
   82.47 : 123.71 = 21.60 : x
2. Step 2: Convert to fraction form
   82.47/123.71 = 21.60/x
3. Step 3: Cross multiply
   82.47x = 123.71 × 21.60
4. Step 4: Simplify right side
   82.47x = 2,672.54
5. Step 5: Solve for x
   x = 2,672.54/82.47
6. Step 6: Final answer
   x = 32.41