Finding the Third Proportional to 938,640 and 1,921,020

Step by Step Solution

1. Step 1: Write the proportion equation
   938,640 : 1,921,020 = 1,921,020 : x
2. Step 2: Convert to fraction form
   938,640/1,921,020 = 1,921,020/x
3. Step 3: Cross multiply
   938,640x = 1,921,020 × 1,921,020
4. Step 4: Simplify right side
   938,640x = 3,690,317,840,400
5. Step 5: Solve for x
   x = 3,690,317,840,400/938,640
6. Step 6: Final answer
   x = 3,931,558.25