Finding the Fourth Proportional to 82.80, 114.18 and 51.72

Step by Step Solution

1. Step 1: Write the proportion equation
   82.80 : 114.18 = 51.72 : x
2. Step 2: Convert to fraction form
   82.80/114.18 = 51.72/x
3. Step 3: Cross multiply
   82.80x = 114.18 × 51.72
4. Step 4: Simplify right side
   82.80x = 5,905.39
5. Step 5: Solve for x
   x = 5,905.39/82.80
6. Step 6: Final answer
   x = 71.32