Finding the Fourth Proportional to 109.12, 150.71 and 100.35

Step by Step Solution

1. Step 1: Write the proportion equation
   109.12 : 150.71 = 100.35 : x
2. Step 2: Convert to fraction form
   109.12/150.71 = 100.35/x
3. Step 3: Cross multiply
   109.12x = 150.71 × 100.35
4. Step 4: Simplify right side
   109.12x = 15,123.25
5. Step 5: Solve for x
   x = 15,123.25/109.12
6. Step 6: Final answer
   x = 138.59