Finding the Fourth Proportional to 100.64, 137.89 and 97.18

Step by Step Solution

1. Step 1: Write the proportion equation
   100.64 : 137.89 = 97.18 : x
2. Step 2: Convert to fraction form
   100.64/137.89 = 97.18/x
3. Step 3: Cross multiply
   100.64x = 137.89 × 97.18
4. Step 4: Simplify right side
   100.64x = 13,400.15
5. Step 5: Solve for x
   x = 13,400.15/100.64
6. Step 6: Final answer
   x = 133.15