Finding the Fourth Proportional to 82.72, 123.37 and 70.61

Step by Step Solution

1. Step 1: Write the proportion equation
   82.72 : 123.37 = 70.61 : x
2. Step 2: Convert to fraction form
   82.72/123.37 = 70.61/x
3. Step 3: Cross multiply
   82.72x = 123.37 × 70.61
4. Step 4: Simplify right side
   82.72x = 8,711.06
5. Step 5: Solve for x
   x = 8,711.06/82.72
6. Step 6: Final answer
   x = 105.31