Finding the Fourth Proportional to 123.79, 185.68 and 42.63

Step by Step Solution

1. Step 1: Write the proportion equation
   123.79 : 185.68 = 42.63 : x
2. Step 2: Convert to fraction form
   123.79/185.68 = 42.63/x
3. Step 3: Cross multiply
   123.79x = 185.68 × 42.63
4. Step 4: Simplify right side
   123.79x = 7,915.30
5. Step 5: Solve for x
   x = 7,915.30/123.79
6. Step 6: Final answer
   x = 63.94