Finding the Fourth Proportional to 67.02, 100.42 and 51.78

Step by Step Solution

1. Step 1: Write the proportion equation
   67.02 : 100.42 = 51.78 : x
2. Step 2: Convert to fraction form
   67.02/100.42 = 51.78/x
3. Step 3: Cross multiply
   67.02x = 100.42 × 51.78
4. Step 4: Simplify right side
   67.02x = 5,199.75
5. Step 5: Solve for x
   x = 5,199.75/67.02
6. Step 6: Final answer
   x = 77.59