Finding the Fourth Proportional to 67.99, 101.91 and 42.30

Step by Step Solution

1. Step 1: Write the proportion equation
   67.99 : 101.91 = 42.30 : x
2. Step 2: Convert to fraction form
   67.99/101.91 = 42.30/x
3. Step 3: Cross multiply
   67.99x = 101.91 × 42.30
4. Step 4: Simplify right side
   67.99x = 4,310.79
5. Step 5: Solve for x
   x = 4,310.79/67.99
6. Step 6: Final answer
   x = 63.40