Finding the Third Proportional to 8,402,406 and 12,680,748

Step by Step Solution

1. Step 1: Write the proportion equation
   8,402,406 : 12,680,748 = 12,680,748 : x
2. Step 2: Convert to fraction form
   8,402,406/12,680,748 = 12,680,748/x
3. Step 3: Cross multiply
   8,402,406x = 12,680,748 × 12,680,748
4. Step 4: Simplify right side
   8,402,406x = 160,801,369,839,504
5. Step 5: Solve for x
   x = 160,801,369,839,504/8,402,406
6. Step 6: Final answer
   x = 19,137,538.68