Finding the Third Proportional to 870.22 and 1,428.56

Step by Step Solution

1. Step 1: Write the proportion equation
   870.22 : 1,428.56 = 1,428.56 : x
2. Step 2: Convert to fraction form
   870.22/1,428.56 = 1,428.56/x
3. Step 3: Cross multiply
   870.22x = 1,428.56 × 1,428.56
4. Step 4: Simplify right side
   870.22x = 2,040,790.82
5. Step 5: Solve for x
   x = 2,040,790.82/870.22
6. Step 6: Final answer
   x = 2,345.15