Finding the Fourth Proportional to 109.17, 150.56 and 72.34

Step by Step Solution

1. Step 1: Write the proportion equation
   109.17 : 150.56 = 72.34 : x
2. Step 2: Convert to fraction form
   109.17/150.56 = 72.34/x
3. Step 3: Cross multiply
   109.17x = 150.56 × 72.34
4. Step 4: Simplify right side
   109.17x = 10,891.51
5. Step 5: Solve for x
   x = 10,891.51/109.17
6. Step 6: Final answer
   x = 99.77