Finding the Third Proportional to 1,428.47 and 2,215.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.47 : 2,215.27 = 2,215.27 : x
2. Step 2: Convert to fraction form
   1,428.47/2,215.27 = 2,215.27/x
3. Step 3: Cross multiply
   1,428.47x = 2,215.27 × 2,215.27
4. Step 4: Simplify right side
   1,428.47x = 4,907,401.79
5. Step 5: Solve for x
   x = 4,907,401.79/1,428.47
6. Step 6: Final answer
   x = 3,435.43