Finding the Fourth Proportional to 103.72, 155.50 and 45.98

Step by Step Solution

1. Step 1: Write the proportion equation
   103.72 : 155.50 = 45.98 : x
2. Step 2: Convert to fraction form
   103.72/155.50 = 45.98/x
3. Step 3: Cross multiply
   103.72x = 155.50 × 45.98
4. Step 4: Simplify right side
   103.72x = 7,149.89
5. Step 5: Solve for x
   x = 7,149.89/103.72
6. Step 6: Final answer
   x = 68.93