Finding the Fourth Proportional to 215.37, 323.10 and 93.78

Step by Step Solution

1. Step 1: Write the proportion equation
   215.37 : 323.10 = 93.78 : x
2. Step 2: Convert to fraction form
   215.37/323.10 = 93.78/x
3. Step 3: Cross multiply
   215.37x = 323.10 × 93.78
4. Step 4: Simplify right side
   215.37x = 30,300.32
5. Step 5: Solve for x
   x = 30,300.32/215.37
6. Step 6: Final answer
   x = 140.69