Finding the Fourth Proportional to 109.63, 164.49 and 100.72

Step by Step Solution

1. Step 1: Write the proportion equation
   109.63 : 164.49 = 100.72 : x
2. Step 2: Convert to fraction form
   109.63/164.49 = 100.72/x
3. Step 3: Cross multiply
   109.63x = 164.49 × 100.72
4. Step 4: Simplify right side
   109.63x = 16,567.02
5. Step 5: Solve for x
   x = 16,567.02/109.63
6. Step 6: Final answer
   x = 151.12