Finding the Fourth Proportional to 143.83, 215.82 and 82.18

Step by Step Solution

1. Step 1: Write the proportion equation
   143.83 : 215.82 = 82.18 : x
2. Step 2: Convert to fraction form
   143.83/215.82 = 82.18/x
3. Step 3: Cross multiply
   143.83x = 215.82 × 82.18
4. Step 4: Simplify right side
   143.83x = 17,736.09
5. Step 5: Solve for x
   x = 17,736.09/143.83
6. Step 6: Final answer
   x = 123.31