Finding the Fourth Proportional to 67.11, 100.72 and 51.99

Step by Step Solution

1. Step 1: Write the proportion equation
   67.11 : 100.72 = 51.99 : x
2. Step 2: Convert to fraction form
   67.11/100.72 = 51.99/x
3. Step 3: Cross multiply
   67.11x = 100.72 × 51.99
4. Step 4: Simplify right side
   67.11x = 5,235.80
5. Step 5: Solve for x
   x = 5,235.80/67.11
6. Step 6: Final answer
   x = 78.02