Finding the Third Proportional to 518,404 and 777,606.50

Step by Step Solution

1. Step 1: Write the proportion equation
   518,404 : 777,606.50 = 777,606.50 : x
2. Step 2: Convert to fraction form
   518,404/777,606.50 = 777,606.50/x
3. Step 3: Cross multiply
   518,404x = 777,606.50 × 777,606.50
4. Step 4: Simplify right side
   518,404x = 604,671,868,842.25
5. Step 5: Solve for x
   x = 604,671,868,842.25/518,404
6. Step 6: Final answer
   x = 1,166,410.50