Finding the Fourth Proportional to 100.82, 151.25 and 90.74

Step by Step Solution

1. Step 1: Write the proportion equation
   100.82 : 151.25 = 90.74 : x
2. Step 2: Convert to fraction form
   100.82/151.25 = 90.74/x
3. Step 3: Cross multiply
   100.82x = 151.25 × 90.74
4. Step 4: Simplify right side
   100.82x = 13,724.43
5. Step 5: Solve for x
   x = 13,724.43/100.82
6. Step 6: Final answer
   x = 136.13