Finding the Third Proportional to 280,015.50 and 434,307

Step by Step Solution

1. Step 1: Write the proportion equation
   280,015.50 : 434,307 = 434,307 : x
2. Step 2: Convert to fraction form
   280,015.50/434,307 = 434,307/x
3. Step 3: Cross multiply
   280,015.50x = 434,307 × 434,307
4. Step 4: Simplify right side
   280,015.50x = 188,622,570,249
5. Step 5: Solve for x
   x = 188,622,570,249/280,015.50
6. Step 6: Final answer
   x = 673,614.75