Finding the Fourth Proportional to 82.51, 123.78 and 28.41

Step by Step Solution

1. Step 1: Write the proportion equation
   82.51 : 123.78 = 28.41 : x
2. Step 2: Convert to fraction form
   82.51/123.78 = 28.41/x
3. Step 3: Cross multiply
   82.51x = 123.78 × 28.41
4. Step 4: Simplify right side
   82.51x = 3,516.59
5. Step 5: Solve for x
   x = 3,516.59/82.51
6. Step 6: Final answer
   x = 42.62