Finding the Fourth Proportional to 123.47, 185.19 and 42.31

Step by Step Solution

1. Step 1: Write the proportion equation
   123.47 : 185.19 = 42.31 : x
2. Step 2: Convert to fraction form
   123.47/185.19 = 42.31/x
3. Step 3: Cross multiply
   123.47x = 185.19 × 42.31
4. Step 4: Simplify right side
   123.47x = 7,835.39
5. Step 5: Solve for x
   x = 7,835.39/123.47
6. Step 6: Final answer
   x = 63.46