Finding the Fourth Proportional to 123.98, 185.15 and 103.70

Step by Step Solution

1. Step 1: Write the proportion equation
   123.98 : 185.15 = 103.70 : x
2. Step 2: Convert to fraction form
   123.98/185.15 = 103.70/x
3. Step 3: Cross multiply
   123.98x = 185.15 × 103.70
4. Step 4: Simplify right side
   123.98x = 19,200.78
5. Step 5: Solve for x
   x = 19,200.78/123.98
6. Step 6: Final answer
   x = 154.88