Finding the Third Proportional to 1,636,561,457.63 and 3,589,969,642.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636,561,457.63 : 3,589,969,642.88 = 3,589,969,642.88 : x
2. Step 2: Convert to fraction form
   1,636,561,457.63/3,589,969,642.88 = 3,589,969,642.88/x
3. Step 3: Cross multiply
   1,636,561,457.63x = 3,589,969,642.88 × 3,589,969,642.88
4. Step 4: Simplify right side
   1,636,561,457.63x = 12,887,882,036,764,055,552
5. Step 5: Solve for x
   x = 12,887,882,036,764,055,552/1,636,561,457.63
6. Step 6: Final answer
   x = 7,874,975,899.45