Finding the Fourth Proportional to 144.51, 216.72 and 83.72

Step by Step Solution

1. Step 1: Write the proportion equation
   144.51 : 216.72 = 83.72 : x
2. Step 2: Convert to fraction form
   144.51/216.72 = 83.72/x
3. Step 3: Cross multiply
   144.51x = 216.72 × 83.72
4. Step 4: Simplify right side
   144.51x = 18,142.71
5. Step 5: Solve for x
   x = 18,142.71/144.51
6. Step 6: Final answer
   x = 125.55