Finding the Third Proportional to 6,439,064 and 13,406,128

Step by Step Solution

1. Step 1: Write the proportion equation
   6,439,064 : 13,406,128 = 13,406,128 : x
2. Step 2: Convert to fraction form
   6,439,064/13,406,128 = 13,406,128/x
3. Step 3: Cross multiply
   6,439,064x = 13,406,128 × 13,406,128
4. Step 4: Simplify right side
   6,439,064x = 179,724,267,952,384
5. Step 5: Solve for x
   x = 179,724,267,952,384/6,439,064
6. Step 6: Final answer
   x = 27,911,551.73