Finding the Fourth Proportional to 98.72, 136.23 and 55.05

Step by Step Solution

1. Step 1: Write the proportion equation
   98.72 : 136.23 = 55.05 : x
2. Step 2: Convert to fraction form
   98.72/136.23 = 55.05/x
3. Step 3: Cross multiply
   98.72x = 136.23 × 55.05
4. Step 4: Simplify right side
   98.72x = 7,500.20
5. Step 5: Solve for x
   x = 7,500.20/98.72
6. Step 6: Final answer
   x = 75.98