Finding the Fourth Proportional to 107.16, 147.81 and 67.78

Step by Step Solution

1. Step 1: Write the proportion equation
   107.16 : 147.81 = 67.78 : x
2. Step 2: Convert to fraction form
   107.16/147.81 = 67.78/x
3. Step 3: Cross multiply
   107.16x = 147.81 × 67.78
4. Step 4: Simplify right side
   107.16x = 10,018.56
5. Step 5: Solve for x
   x = 10,018.56/107.16
6. Step 6: Final answer
   x = 93.49