Finding the Third Proportional to 294,516.50 and 640,585

Step by Step Solution

1. Step 1: Write the proportion equation
   294,516.50 : 640,585 = 640,585 : x
2. Step 2: Convert to fraction form
   294,516.50/640,585 = 640,585/x
3. Step 3: Cross multiply
   294,516.50x = 640,585 × 640,585
4. Step 4: Simplify right side
   294,516.50x = 410,349,142,225
5. Step 5: Solve for x
   x = 410,349,142,225/294,516.50
6. Step 6: Final answer
   x = 1,393,297.63