Finding the Fourth Proportional to 109.25, 150.71 and 72.40

Step by Step Solution

1. Step 1: Write the proportion equation
   109.25 : 150.71 = 72.40 : x
2. Step 2: Convert to fraction form
   109.25/150.71 = 72.40/x
3. Step 3: Cross multiply
   109.25x = 150.71 × 72.40
4. Step 4: Simplify right side
   109.25x = 10,911.21
5. Step 5: Solve for x
   x = 10,911.21/109.25
6. Step 6: Final answer
   x = 99.87