Finding the Fourth Proportional to 100.38, 149.78 and 91.29

Step by Step Solution

1. Step 1: Write the proportion equation
   100.38 : 149.78 = 91.29 : x
2. Step 2: Convert to fraction form
   100.38/149.78 = 91.29/x
3. Step 3: Cross multiply
   100.38x = 149.78 × 91.29
4. Step 4: Simplify right side
   100.38x = 13,673.42
5. Step 5: Solve for x
   x = 13,673.42/100.38
6. Step 6: Final answer
   x = 136.22