Finding the Third Proportional to 217,890 and 300,046.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,890 : 300,046.50 = 300,046.50 : x
2. Step 2: Convert to fraction form
   217,890/300,046.50 = 300,046.50/x
3. Step 3: Cross multiply
   217,890x = 300,046.50 × 300,046.50
4. Step 4: Simplify right side
   217,890x = 90,027,902,162.25
5. Step 5: Solve for x
   x = 90,027,902,162.25/217,890
6. Step 6: Final answer
   x = 413,180.51