Finding the Fourth Proportional to 108.90, 162.42 and 105.03

Step by Step Solution

1. Step 1: Write the proportion equation
   108.90 : 162.42 = 105.03 : x
2. Step 2: Convert to fraction form
   108.90/162.42 = 105.03/x
3. Step 3: Cross multiply
   108.90x = 162.42 × 105.03
4. Step 4: Simplify right side
   108.90x = 17,059.17
5. Step 5: Solve for x
   x = 17,059.17/108.90
6. Step 6: Final answer
   x = 156.65