Finding the Fourth Proportional to 67.72, 93.30 and 57.34

Step by Step Solution

1. Step 1: Write the proportion equation
   67.72 : 93.30 = 57.34 : x
2. Step 2: Convert to fraction form
   67.72/93.30 = 57.34/x
3. Step 3: Cross multiply
   67.72x = 93.30 × 57.34
4. Step 4: Simplify right side
   67.72x = 5,349.82
5. Step 5: Solve for x
   x = 5,349.82/67.72
6. Step 6: Final answer
   x = 79.00