Finding the Fourth Proportional to 82.72, 123.29 and 79.12

Step by Step Solution

1. Step 1: Write the proportion equation
   82.72 : 123.29 = 79.12 : x
2. Step 2: Convert to fraction form
   82.72/123.29 = 79.12/x
3. Step 3: Cross multiply
   82.72x = 123.29 × 79.12
4. Step 4: Simplify right side
   82.72x = 9,754.70
5. Step 5: Solve for x
   x = 9,754.70/82.72
6. Step 6: Final answer
   x = 117.92