Finding the Fourth Proportional to 108.34, 149.59 and 100.15

Step by Step Solution

1. Step 1: Write the proportion equation
   108.34 : 149.59 = 100.15 : x
2. Step 2: Convert to fraction form
   108.34/149.59 = 100.15/x
3. Step 3: Cross multiply
   108.34x = 149.59 × 100.15
4. Step 4: Simplify right side
   108.34x = 14,981.44
5. Step 5: Solve for x
   x = 14,981.44/108.34
6. Step 6: Final answer
   x = 138.28