Finding the Third Proportional to 7,978,998 and 12,636,488.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978,998 : 12,636,488.50 = 12,636,488.50 : x
2. Step 2: Convert to fraction form
   7,978,998/12,636,488.50 = 12,636,488.50/x
3. Step 3: Cross multiply
   7,978,998x = 12,636,488.50 × 12,636,488.50
4. Step 4: Simplify right side
   7,978,998x = 159,680,841,610,632.25
5. Step 5: Solve for x
   x = 159,680,841,610,632.25/7,978,998
6. Step 6: Final answer
   x = 20,012,643.39