Finding the Fourth Proportional to 68.72, 94.72 and 42.80

Step by Step Solution

1. Step 1: Write the proportion equation
   68.72 : 94.72 = 42.80 : x
2. Step 2: Convert to fraction form
   68.72/94.72 = 42.80/x
3. Step 3: Cross multiply
   68.72x = 94.72 × 42.80
4. Step 4: Simplify right side
   68.72x = 4,054.02
5. Step 5: Solve for x
   x = 4,054.02/68.72
6. Step 6: Final answer
   x = 58.99