Finding the Third Proportional to 354,667.50 and 487,705.50

Step by Step Solution

1. Step 1: Write the proportion equation
   354,667.50 : 487,705.50 = 487,705.50 : x
2. Step 2: Convert to fraction form
   354,667.50/487,705.50 = 487,705.50/x
3. Step 3: Cross multiply
   354,667.50x = 487,705.50 × 487,705.50
4. Step 4: Simplify right side
   354,667.50x = 237,856,654,730.25
5. Step 5: Solve for x
   x = 237,856,654,730.25/354,667.50
6. Step 6: Final answer
   x = 670,646.89