Finding the Fourth Proportional to 78.48, 108.24 and 67.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78.48 : 108.24 = 67.56 : x
2. Step 2: Convert to fraction form
   78.48/108.24 = 67.56/x
3. Step 3: Cross multiply
   78.48x = 108.24 × 67.56
4. Step 4: Simplify right side
   78.48x = 7,312.69
5. Step 5: Solve for x
   x = 7,312.69/78.48
6. Step 6: Final answer
   x = 93.18