Finding the Third Proportional to 3,547,470 and 7,781,678

Step by Step Solution

1. Step 1: Write the proportion equation
   3,547,470 : 7,781,678 = 7,781,678 : x
2. Step 2: Convert to fraction form
   3,547,470/7,781,678 = 7,781,678/x
3. Step 3: Cross multiply
   3,547,470x = 7,781,678 × 7,781,678
4. Step 4: Simplify right side
   3,547,470x = 60,554,512,495,684
5. Step 5: Solve for x
   x = 60,554,512,495,684/3,547,470
6. Step 6: Final answer
   x = 17,069,774.37