Finding the Fourth Proportional to 216.02, 298.00 and 142.31

Step by Step Solution

1. Step 1: Write the proportion equation
   216.02 : 298.00 = 142.31 : x
2. Step 2: Convert to fraction form
   216.02/298.00 = 142.31/x
3. Step 3: Cross multiply
   216.02x = 298.00 × 142.31
4. Step 4: Simplify right side
   216.02x = 42,406.83
5. Step 5: Solve for x
   x = 42,406.83/216.02
6. Step 6: Final answer
   x = 196.31