Finding the Fourth Proportional to 123.42, 184.78 and 100.86

Step by Step Solution

1. Step 1: Write the proportion equation
   123.42 : 184.78 = 100.86 : x
2. Step 2: Convert to fraction form
   123.42/184.78 = 100.86/x
3. Step 3: Cross multiply
   123.42x = 184.78 × 100.86
4. Step 4: Simplify right side
   123.42x = 18,637.38
5. Step 5: Solve for x
   x = 18,637.38/123.42
6. Step 6: Final answer
   x = 151.00