Finding the Fourth Proportional to 82.30, 123.49 and 43.79

Step by Step Solution

1. Step 1: Write the proportion equation
   82.30 : 123.49 = 43.79 : x
2. Step 2: Convert to fraction form
   82.30/123.49 = 43.79/x
3. Step 3: Cross multiply
   82.30x = 123.49 × 43.79
4. Step 4: Simplify right side
   82.30x = 5,407.01
5. Step 5: Solve for x
   x = 5,407.01/82.30
6. Step 6: Final answer
   x = 65.70