Finding the Third Proportional to 1,428.19 and 1,921.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.19 : 1,921.22 = 1,921.22 : x
2. Step 2: Convert to fraction form
   1,428.19/1,921.22 = 1,921.22/x
3. Step 3: Cross multiply
   1,428.19x = 1,921.22 × 1,921.22
4. Step 4: Simplify right side
   1,428.19x = 3,691,081.49
5. Step 5: Solve for x
   x = 3,691,081.49/1,428.19
6. Step 6: Final answer
   x = 2,584.45