Finding the Fourth Proportional to 82.10, 113.31 and 50.99

Step by Step Solution

1. Step 1: Write the proportion equation
   82.10 : 113.31 = 50.99 : x
2. Step 2: Convert to fraction form
   82.10/113.31 = 50.99/x
3. Step 3: Cross multiply
   82.10x = 113.31 × 50.99
4. Step 4: Simplify right side
   82.10x = 5,778.15
5. Step 5: Solve for x
   x = 5,778.15/82.10
6. Step 6: Final answer
   x = 70.38