Finding the Fourth Proportional to 196.72, 294.98 and 105.40

Step by Step Solution

1. Step 1: Write the proportion equation
   196.72 : 294.98 = 105.40 : x
2. Step 2: Convert to fraction form
   196.72/294.98 = 105.40/x
3. Step 3: Cross multiply
   196.72x = 294.98 × 105.40
4. Step 4: Simplify right side
   196.72x = 31,090.89
5. Step 5: Solve for x
   x = 31,090.89/196.72
6. Step 6: Final answer
   x = 158.05