Finding the Fourth Proportional to 123.60, 185.43 and 42.43

Step by Step Solution

1. Step 1: Write the proportion equation
   123.60 : 185.43 = 42.43 : x
2. Step 2: Convert to fraction form
   123.60/185.43 = 42.43/x
3. Step 3: Cross multiply
   123.60x = 185.43 × 42.43
4. Step 4: Simplify right side
   123.60x = 7,866.66
5. Step 5: Solve for x
   x = 7,866.66/123.60
6. Step 6: Final answer
   x = 63.65