Finding the Third Proportional to 364,989 and 780,418.50

Step by Step Solution

1. Step 1: Write the proportion equation
   364,989 : 780,418.50 = 780,418.50 : x
2. Step 2: Convert to fraction form
   364,989/780,418.50 = 780,418.50/x
3. Step 3: Cross multiply
   364,989x = 780,418.50 × 780,418.50
4. Step 4: Simplify right side
   364,989x = 609,053,035,142.25
5. Step 5: Solve for x
   x = 609,053,035,142.25/364,989
6. Step 6: Final answer
   x = 1,668,688.74