Finding the Fourth Proportional to 82.15, 113.37 and 45.31

Step by Step Solution

1. Step 1: Write the proportion equation
   82.15 : 113.37 = 45.31 : x
2. Step 2: Convert to fraction form
   82.15/113.37 = 45.31/x
3. Step 3: Cross multiply
   82.15x = 113.37 × 45.31
4. Step 4: Simplify right side
   82.15x = 5,136.55
5. Step 5: Solve for x
   x = 5,136.55/82.15
6. Step 6: Final answer
   x = 62.53