Finding the Fourth Proportional to 123.65, 185.43 and 42.47

Step by Step Solution

1. Step 1: Write the proportion equation
   123.65 : 185.43 = 42.47 : x
2. Step 2: Convert to fraction form
   123.65/185.43 = 42.47/x
3. Step 3: Cross multiply
   123.65x = 185.43 × 42.47
4. Step 4: Simplify right side
   123.65x = 7,875.14
5. Step 5: Solve for x
   x = 7,875.14/123.65
6. Step 6: Final answer
   x = 63.69