Finding the Third Proportional to 6,406,680 and 8,629,380

Step by Step Solution

1. Step 1: Write the proportion equation
   6,406,680 : 8,629,380 = 8,629,380 : x
2. Step 2: Convert to fraction form
   6,406,680/8,629,380 = 8,629,380/x
3. Step 3: Cross multiply
   6,406,680x = 8,629,380 × 8,629,380
4. Step 4: Simplify right side
   6,406,680x = 74,466,199,184,400
5. Step 5: Solve for x
   x = 74,466,199,184,400/6,406,680
6. Step 6: Final answer
   x = 11,623,211.90