Finding the Fourth Proportional to 90.96, 136.43 and 30.10

Step by Step Solution

1. Step 1: Write the proportion equation
   90.96 : 136.43 = 30.10 : x
2. Step 2: Convert to fraction form
   90.96/136.43 = 30.10/x
3. Step 3: Cross multiply
   90.96x = 136.43 × 30.10
4. Step 4: Simplify right side
   90.96x = 4,105.86
5. Step 5: Solve for x
   x = 4,105.86/90.96
6. Step 6: Final answer
   x = 45.14