Finding the Third Proportional to 1,378,624 and 1,985,640

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378,624 : 1,985,640 = 1,985,640 : x
2. Step 2: Convert to fraction form
   1,378,624/1,985,640 = 1,985,640/x
3. Step 3: Cross multiply
   1,378,624x = 1,985,640 × 1,985,640
4. Step 4: Simplify right side
   1,378,624x = 3,942,766,209,600
5. Step 5: Solve for x
   x = 3,942,766,209,600/1,378,624
6. Step 6: Final answer
   x = 2,859,928.60