Finding the Third Proportional to 778,440 and 1,684,820

Step by Step Solution

1. Step 1: Write the proportion equation
   778,440 : 1,684,820 = 1,684,820 : x
2. Step 2: Convert to fraction form
   778,440/1,684,820 = 1,684,820/x
3. Step 3: Cross multiply
   778,440x = 1,684,820 × 1,684,820
4. Step 4: Simplify right side
   778,440x = 2,838,618,432,400
5. Step 5: Solve for x
   x = 2,838,618,432,400/778,440
6. Step 6: Final answer
   x = 3,646,547.50