Finding the Fourth Proportional to 216.15, 298.05 and 141.27

Step by Step Solution

1. Step 1: Write the proportion equation
   216.15 : 298.05 = 141.27 : x
2. Step 2: Convert to fraction form
   216.15/298.05 = 141.27/x
3. Step 3: Cross multiply
   216.15x = 298.05 × 141.27
4. Step 4: Simplify right side
   216.15x = 42,105.52
5. Step 5: Solve for x
   x = 42,105.52/216.15
6. Step 6: Final answer
   x = 194.80