Finding the Fourth Proportional to 103.02, 154.56 and 78.69

Step by Step Solution

1. Step 1: Write the proportion equation
   103.02 : 154.56 = 78.69 : x
2. Step 2: Convert to fraction form
   103.02/154.56 = 78.69/x
3. Step 3: Cross multiply
   103.02x = 154.56 × 78.69
4. Step 4: Simplify right side
   103.02x = 12,162.33
5. Step 5: Solve for x
   x = 12,162.33/103.02
6. Step 6: Final answer
   x = 118.06