Finding the Fourth Proportional to 82.47, 123.69 and 39.12

Step by Step Solution

1. Step 1: Write the proportion equation
   82.47 : 123.69 = 39.12 : x
2. Step 2: Convert to fraction form
   82.47/123.69 = 39.12/x
3. Step 3: Cross multiply
   82.47x = 123.69 × 39.12
4. Step 4: Simplify right side
   82.47x = 4,839.13
5. Step 5: Solve for x
   x = 4,839.13/82.47
6. Step 6: Final answer
   x = 58.67