Finding the Fourth Proportional to 137.98, 190.59 and 103.17

Step by Step Solution

1. Step 1: Write the proportion equation
   137.98 : 190.59 = 103.17 : x
2. Step 2: Convert to fraction form
   137.98/190.59 = 103.17/x
3. Step 3: Cross multiply
   137.98x = 190.59 × 103.17
4. Step 4: Simplify right side
   137.98x = 19,662.55
5. Step 5: Solve for x
   x = 19,662.55/137.98
6. Step 6: Final answer
   x = 142.50