Finding the Fourth Proportional to 216.10, 323.72 and 100.38

Step by Step Solution

1. Step 1: Write the proportion equation
   216.10 : 323.72 = 100.38 : x
2. Step 2: Convert to fraction form
   216.10/323.72 = 100.38/x
3. Step 3: Cross multiply
   216.10x = 323.72 × 100.38
4. Step 4: Simplify right side
   216.10x = 32,495.01
5. Step 5: Solve for x
   x = 32,495.01/216.10
6. Step 6: Final answer
   x = 150.37