Finding the Fourth Proportional to 215.91, 323.89 and 100.29

Step by Step Solution

1. Step 1: Write the proportion equation
   215.91 : 323.89 = 100.29 : x
2. Step 2: Convert to fraction form
   215.91/323.89 = 100.29/x
3. Step 3: Cross multiply
   215.91x = 323.89 × 100.29
4. Step 4: Simplify right side
   215.91x = 32,483.47
5. Step 5: Solve for x
   x = 32,483.47/215.91
6. Step 6: Final answer
   x = 150.45