Finding the Third Proportional to 311,419.69 and 681,022.69

Step by Step Solution

1. Step 1: Write the proportion equation
   311,419.69 : 681,022.69 = 681,022.69 : x
2. Step 2: Convert to fraction form
   311,419.69/681,022.69 = 681,022.69/x
3. Step 3: Cross multiply
   311,419.69x = 681,022.69 × 681,022.69
4. Step 4: Simplify right side
   311,419.69x = 463,791,900,889.72
5. Step 5: Solve for x
   x = 463,791,900,889.72/311,419.69
6. Step 6: Final answer
   x = 1,489,282.53