Finding the Fourth Proportional to 103.84, 155.59 and 78.03

Step by Step Solution

1. Step 1: Write the proportion equation
   103.84 : 155.59 = 78.03 : x
2. Step 2: Convert to fraction form
   103.84/155.59 = 78.03/x
3. Step 3: Cross multiply
   103.84x = 155.59 × 78.03
4. Step 4: Simplify right side
   103.84x = 12,140.49
5. Step 5: Solve for x
   x = 12,140.49/103.84
6. Step 6: Final answer
   x = 116.92