Finding the Fourth Proportional to 143.51, 215.46 and 109.69

Step by Step Solution

1. Step 1: Write the proportion equation
   143.51 : 215.46 = 109.69 : x
2. Step 2: Convert to fraction form
   143.51/215.46 = 109.69/x
3. Step 3: Cross multiply
   143.51x = 215.46 × 109.69
4. Step 4: Simplify right side
   143.51x = 23,633.27
5. Step 5: Solve for x
   x = 23,633.27/143.51
6. Step 6: Final answer
   x = 164.69