Finding the Fourth Proportional to 98.72, 147.89 and 72.75

Step by Step Solution

1. Step 1: Write the proportion equation
   98.72 : 147.89 = 72.75 : x
2. Step 2: Convert to fraction form
   98.72/147.89 = 72.75/x
3. Step 3: Cross multiply
   98.72x = 147.89 × 72.75
4. Step 4: Simplify right side
   98.72x = 10,759.18
5. Step 5: Solve for x
   x = 10,759.18/98.72
6. Step 6: Final answer
   x = 108.99