Finding the Third Proportional to 217,399.50 and 300,397.88

Step by Step Solution

1. Step 1: Write the proportion equation
   217,399.50 : 300,397.88 = 300,397.88 : x
2. Step 2: Convert to fraction form
   217,399.50/300,397.88 = 300,397.88/x
3. Step 3: Cross multiply
   217,399.50x = 300,397.88 × 300,397.88
4. Step 4: Simplify right side
   217,399.50x = 90,238,883,304.52
5. Step 5: Solve for x
   x = 90,238,883,304.52/217,399.50
6. Step 6: Final answer
   x = 415,083.21