Finding the Third Proportional to 2,115.56 and 4,428.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.56 : 4,428.56 = 4,428.56 : x
2. Step 2: Convert to fraction form
   2,115.56/4,428.56 = 4,428.56/x
3. Step 3: Cross multiply
   2,115.56x = 4,428.56 × 4,428.56
4. Step 4: Simplify right side
   2,115.56x = 19,612,165.82
5. Step 5: Solve for x
   x = 19,612,165.82/2,115.56
6. Step 6: Final answer
   x = 9,270.43