Finding the Fourth Proportional to 98.72, 136.32 and 98.72

Step by Step Solution

1. Step 1: Write the proportion equation
   98.72 : 136.32 = 98.72 : x
2. Step 2: Convert to fraction form
   98.72/136.32 = 98.72/x
3. Step 3: Cross multiply
   98.72x = 136.32 × 98.72
4. Step 4: Simplify right side
   98.72x = 13,457.51
5. Step 5: Solve for x
   x = 13,457.51/98.72
6. Step 6: Final answer
   x = 136.32