Finding the Fourth Proportional to 123.81, 185.72 and 42.68

Step by Step Solution

1. Step 1: Write the proportion equation
   123.81 : 185.72 = 42.68 : x
2. Step 2: Convert to fraction form
   123.81/185.72 = 42.68/x
3. Step 3: Cross multiply
   123.81x = 185.72 × 42.68
4. Step 4: Simplify right side
   123.81x = 7,925.39
5. Step 5: Solve for x
   x = 7,925.39/123.81
6. Step 6: Final answer
   x = 64.01