Finding the Fourth Proportional to 103.84, 142.72 and 91.49

Step by Step Solution

1. Step 1: Write the proportion equation
   103.84 : 142.72 = 91.49 : x
2. Step 2: Convert to fraction form
   103.84/142.72 = 91.49/x
3. Step 3: Cross multiply
   103.84x = 142.72 × 91.49
4. Step 4: Simplify right side
   103.84x = 13,057.03
5. Step 5: Solve for x
   x = 13,057.03/103.84
6. Step 6: Final answer
   x = 125.74