Finding the Fourth Proportional to 67.13, 100.56 and 51.86

Step by Step Solution

1. Step 1: Write the proportion equation
   67.13 : 100.56 = 51.86 : x
2. Step 2: Convert to fraction form
   67.13/100.56 = 51.86/x
3. Step 3: Cross multiply
   67.13x = 100.56 × 51.86
4. Step 4: Simplify right side
   67.13x = 5,215.04
5. Step 5: Solve for x
   x = 5,215.04/67.13
6. Step 6: Final answer
   x = 77.69