Finding the Fourth Proportional to 82.42, 123.63 and 47.72

Step by Step Solution

1. Step 1: Write the proportion equation
   82.42 : 123.63 = 47.72 : x
2. Step 2: Convert to fraction form
   82.42/123.63 = 47.72/x
3. Step 3: Cross multiply
   82.42x = 123.63 × 47.72
4. Step 4: Simplify right side
   82.42x = 5,899.75
5. Step 5: Solve for x
   x = 5,899.75/82.42
6. Step 6: Final answer
   x = 71.58