Finding the Fourth Proportional to 109.38, 164.77 and 103.72

Step by Step Solution

1. Step 1: Write the proportion equation
   109.38 : 164.77 = 103.72 : x
2. Step 2: Convert to fraction form
   109.38/164.77 = 103.72/x
3. Step 3: Cross multiply
   109.38x = 164.77 × 103.72
4. Step 4: Simplify right side
   109.38x = 17,089.94
5. Step 5: Solve for x
   x = 17,089.94/109.38
6. Step 6: Final answer
   x = 156.24