Finding the Third Proportional to 217,521 and 336,145.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,521 : 336,145.50 = 336,145.50 : x
2. Step 2: Convert to fraction form
   217,521/336,145.50 = 336,145.50/x
3. Step 3: Cross multiply
   217,521x = 336,145.50 × 336,145.50
4. Step 4: Simplify right side
   217,521x = 112,993,797,170.25
5. Step 5: Solve for x
   x = 112,993,797,170.25/217,521
6. Step 6: Final answer
   x = 519,461.56