Finding the Third Proportional to 98.81 and 210.56

Step by Step Solution

1. Step 1: Write the proportion equation
   98.81 : 210.56 = 210.56 : x
2. Step 2: Convert to fraction form
   98.81/210.56 = 210.56/x
3. Step 3: Cross multiply
   98.81x = 210.56 × 210.56
4. Step 4: Simplify right side
   98.81x = 44,336.57
5. Step 5: Solve for x
   x = 44,336.57/98.81
6. Step 6: Final answer
   x = 448.69