Finding the Third Proportional to 561,411 and 1,218,780

Step by Step Solution

1. Step 1: Write the proportion equation
   561,411 : 1,218,780 = 1,218,780 : x
2. Step 2: Convert to fraction form
   561,411/1,218,780 = 1,218,780/x
3. Step 3: Cross multiply
   561,411x = 1,218,780 × 1,218,780
4. Step 4: Simplify right side
   561,411x = 1,485,424,688,400
5. Step 5: Solve for x
   x = 1,485,424,688,400/561,411
6. Step 6: Final answer
   x = 2,645,877.42