Finding the Third Proportional to 300,645 and 699,124.50

Step by Step Solution

1. Step 1: Write the proportion equation
   300,645 : 699,124.50 = 699,124.50 : x
2. Step 2: Convert to fraction form
   300,645/699,124.50 = 699,124.50/x
3. Step 3: Cross multiply
   300,645x = 699,124.50 × 699,124.50
4. Step 4: Simplify right side
   300,645x = 488,775,066,500.25
5. Step 5: Solve for x
   x = 488,775,066,500.25/300,645
6. Step 6: Final answer
   x = 1,625,754.85