Finding the Third Proportional to 459,085.50 and 645,345

Step by Step Solution

1. Step 1: Write the proportion equation
   459,085.50 : 645,345 = 645,345 : x
2. Step 2: Convert to fraction form
   459,085.50/645,345 = 645,345/x
3. Step 3: Cross multiply
   459,085.50x = 645,345 × 645,345
4. Step 4: Simplify right side
   459,085.50x = 416,470,169,025
5. Step 5: Solve for x
   x = 416,470,169,025/459,085.50
6. Step 6: Final answer
   x = 907,173.43