Finding the Fourth Proportional to 82.63, 123.93 and 21.76

Step by Step Solution

1. Step 1: Write the proportion equation
   82.63 : 123.93 = 21.76 : x
2. Step 2: Convert to fraction form
   82.63/123.93 = 21.76/x
3. Step 3: Cross multiply
   82.63x = 123.93 × 21.76
4. Step 4: Simplify right side
   82.63x = 2,696.72
5. Step 5: Solve for x
   x = 2,696.72/82.63
6. Step 6: Final answer
   x = 32.64