Finding the Third Proportional to 8,685.56 and 9,900.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,685.56 : 9,900.56 = 9,900.56 : x
2. Step 2: Convert to fraction form
   8,685.56/9,900.56 = 9,900.56/x
3. Step 3: Cross multiply
   8,685.56x = 9,900.56 × 9,900.56
4. Step 4: Simplify right side
   8,685.56x = 98,021,137.82
5. Step 5: Solve for x
   x = 98,021,137.82/8,685.56
6. Step 6: Final answer
   x = 11,285.53