Finding the Fourth Proportional to 162.42, 243.40 and 90.10

Step by Step Solution

1. Step 1: Write the proportion equation
   162.42 : 243.40 = 90.10 : x
2. Step 2: Convert to fraction form
   162.42/243.40 = 90.10/x
3. Step 3: Cross multiply
   162.42x = 243.40 × 90.10
4. Step 4: Simplify right side
   162.42x = 21,930.34
5. Step 5: Solve for x
   x = 21,930.34/162.42
6. Step 6: Final answer
   x = 135.02