Finding the Fourth Proportional to 98.72, 146.72 and 91.04

Step by Step Solution

1. Step 1: Write the proportion equation
   98.72 : 146.72 = 91.04 : x
2. Step 2: Convert to fraction form
   98.72/146.72 = 91.04/x
3. Step 3: Cross multiply
   98.72x = 146.72 × 91.04
4. Step 4: Simplify right side
   98.72x = 13,357.39
5. Step 5: Solve for x
   x = 13,357.39/98.72
6. Step 6: Final answer
   x = 135.31