Finding the Fourth Proportional to 82.15, 113.31 and 51.05

Step by Step Solution

1. Step 1: Write the proportion equation
   82.15 : 113.31 = 51.05 : x
2. Step 2: Convert to fraction form
   82.15/113.31 = 51.05/x
3. Step 3: Cross multiply
   82.15x = 113.31 × 51.05
4. Step 4: Simplify right side
   82.15x = 5,784.76
5. Step 5: Solve for x
   x = 5,784.76/82.15
6. Step 6: Final answer
   x = 70.42