Finding the Third Proportional to 378,487.69 and 799,621.88

Step by Step Solution

1. Step 1: Write the proportion equation
   378,487.69 : 799,621.88 = 799,621.88 : x
2. Step 2: Convert to fraction form
   378,487.69/799,621.88 = 799,621.88/x
3. Step 3: Cross multiply
   378,487.69x = 799,621.88 × 799,621.88
4. Step 4: Simplify right side
   378,487.69x = 639,395,142,978.52
5. Step 5: Solve for x
   x = 639,395,142,978.52/378,487.69
6. Step 6: Final answer
   x = 1,689,341.99