Finding the Fourth Proportional to 90.17, 124.42 and 50.82

Step by Step Solution

1. Step 1: Write the proportion equation
   90.17 : 124.42 = 50.82 : x
2. Step 2: Convert to fraction form
   90.17/124.42 = 50.82/x
3. Step 3: Cross multiply
   90.17x = 124.42 × 50.82
4. Step 4: Simplify right side
   90.17x = 6,323.02
5. Step 5: Solve for x
   x = 6,323.02/90.17
6. Step 6: Final answer
   x = 70.12