Finding the Fourth Proportional to 109.18, 150.59 and 72.29

Step by Step Solution

1. Step 1: Write the proportion equation
   109.18 : 150.59 = 72.29 : x
2. Step 2: Convert to fraction form
   109.18/150.59 = 72.29/x
3. Step 3: Cross multiply
   109.18x = 150.59 × 72.29
4. Step 4: Simplify right side
   109.18x = 10,886.71
5. Step 5: Solve for x
   x = 10,886.71/109.18
6. Step 6: Final answer
   x = 99.71