Finding the Third Proportional to 3,945,403 and 8,490,043

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945,403 : 8,490,043 = 8,490,043 : x
2. Step 2: Convert to fraction form
   3,945,403/8,490,043 = 8,490,043/x
3. Step 3: Cross multiply
   3,945,403x = 8,490,043 × 8,490,043
4. Step 4: Simplify right side
   3,945,403x = 72,080,830,141,849
5. Step 5: Solve for x
   x = 72,080,830,141,849/3,945,403
6. Step 6: Final answer
   x = 18,269,573.51