Finding the Fourth Proportional to 216.25, 298.15 and 142.59

Step by Step Solution

1. Step 1: Write the proportion equation
   216.25 : 298.15 = 142.59 : x
2. Step 2: Convert to fraction form
   216.25/298.15 = 142.59/x
3. Step 3: Cross multiply
   216.25x = 298.15 × 142.59
4. Step 4: Simplify right side
   216.25x = 42,513.21
5. Step 5: Solve for x
   x = 42,513.21/216.25
6. Step 6: Final answer
   x = 196.59