Finding the Fourth Proportional to 123.36, 185.31 and 100.86

Step by Step Solution

1. Step 1: Write the proportion equation
   123.36 : 185.31 = 100.86 : x
2. Step 2: Convert to fraction form
   123.36/185.31 = 100.86/x
3. Step 3: Cross multiply
   123.36x = 185.31 × 100.86
4. Step 4: Simplify right side
   123.36x = 18,690.37
5. Step 5: Solve for x
   x = 18,690.37/123.36
6. Step 6: Final answer
   x = 151.51