Finding the Fourth Proportional to 82.39, 123.57 and 43.87

Step by Step Solution

1. Step 1: Write the proportion equation
   82.39 : 123.57 = 43.87 : x
2. Step 2: Convert to fraction form
   82.39/123.57 = 43.87/x
3. Step 3: Cross multiply
   82.39x = 123.57 × 43.87
4. Step 4: Simplify right side
   82.39x = 5,421.02
5. Step 5: Solve for x
   x = 5,421.02/82.39
6. Step 6: Final answer
   x = 65.80