Finding the Fourth Proportional to 82.45, 113.72 and 53.31

Step by Step Solution

1. Step 1: Write the proportion equation
   82.45 : 113.72 = 53.31 : x
2. Step 2: Convert to fraction form
   82.45/113.72 = 53.31/x
3. Step 3: Cross multiply
   82.45x = 113.72 × 53.31
4. Step 4: Simplify right side
   82.45x = 6,062.41
5. Step 5: Solve for x
   x = 6,062.41/82.45
6. Step 6: Final answer
   x = 73.53