Finding the Fourth Proportional to 109.82, 151.77 and 90.12

Step by Step Solution

1. Step 1: Write the proportion equation
   109.82 : 151.77 = 90.12 : x
2. Step 2: Convert to fraction form
   109.82/151.77 = 90.12/x
3. Step 3: Cross multiply
   109.82x = 151.77 × 90.12
4. Step 4: Simplify right side
   109.82x = 13,677.51
5. Step 5: Solve for x
   x = 13,677.51/109.82
6. Step 6: Final answer
   x = 124.54