Finding the Third Proportional to 400,519.69 and 619,956.56

Step by Step Solution

1. Step 1: Write the proportion equation
   400,519.69 : 619,956.56 = 619,956.56 : x
2. Step 2: Convert to fraction form
   400,519.69/619,956.56 = 619,956.56/x
3. Step 3: Cross multiply
   400,519.69x = 619,956.56 × 619,956.56
4. Step 4: Simplify right side
   400,519.69x = 384,346,139,386.82
5. Step 5: Solve for x
   x = 384,346,139,386.82/400,519.69
6. Step 6: Final answer
   x = 959,618.59