Finding the Third Proportional to 288,414 and 621,181.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,414 : 621,181.50 = 621,181.50 : x
2. Step 2: Convert to fraction form
   288,414/621,181.50 = 621,181.50/x
3. Step 3: Cross multiply
   288,414x = 621,181.50 × 621,181.50
4. Step 4: Simplify right side
   288,414x = 385,866,455,942.25
5. Step 5: Solve for x
   x = 385,866,455,942.25/288,414
6. Step 6: Final answer
   x = 1,337,890.87