Finding the Fourth Proportional to 100.83, 151.34 and 90.06

Step by Step Solution

1. Step 1: Write the proportion equation
   100.83 : 151.34 = 90.06 : x
2. Step 2: Convert to fraction form
   100.83/151.34 = 90.06/x
3. Step 3: Cross multiply
   100.83x = 151.34 × 90.06
4. Step 4: Simplify right side
   100.83x = 13,629.23
5. Step 5: Solve for x
   x = 13,629.23/100.83
6. Step 6: Final answer
   x = 135.17