Finding the Fourth Proportional to 114.40, 170.72 and 100.72

Step by Step Solution

1. Step 1: Write the proportion equation
   114.40 : 170.72 = 100.72 : x
2. Step 2: Convert to fraction form
   114.40/170.72 = 100.72/x
3. Step 3: Cross multiply
   114.40x = 170.72 × 100.72
4. Step 4: Simplify right side
   114.40x = 17,194.92
5. Step 5: Solve for x
   x = 17,194.92/114.40
6. Step 6: Final answer
   x = 150.31