Finding the Fourth Proportional to 102.50, 141.28 and 74.82

Step by Step Solution

1. Step 1: Write the proportion equation
   102.50 : 141.28 = 74.82 : x
2. Step 2: Convert to fraction form
   102.50/141.28 = 74.82/x
3. Step 3: Cross multiply
   102.50x = 141.28 × 74.82
4. Step 4: Simplify right side
   102.50x = 10,570.91
5. Step 5: Solve for x
   x = 10,570.91/102.50
6. Step 6: Final answer
   x = 103.13