Finding the Fourth Proportional to 123.18, 185.48 and 101.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123.18 : 185.48 = 101.72 : x
2. Step 2: Convert to fraction form
   123.18/185.48 = 101.72/x
3. Step 3: Cross multiply
   123.18x = 185.48 × 101.72
4. Step 4: Simplify right side
   123.18x = 18,867.03
5. Step 5: Solve for x
   x = 18,867.03/123.18
6. Step 6: Final answer
   x = 153.17