Finding the Fourth Proportional to 215.83, 297.89 and 142

Step by Step Solution

1. Step 1: Write the proportion equation
   215.83 : 297.89 = 142 : x
2. Step 2: Convert to fraction form
   215.83/297.89 = 142/x
3. Step 3: Cross multiply
   215.83x = 297.89 × 142
4. Step 4: Simplify right side
   215.83x = 42,299.67
5. Step 5: Solve for x
   x = 42,299.67/215.83
6. Step 6: Final answer
   x = 195.99