Finding the Third Proportional to 413,247 and 638,572.50

Step by Step Solution

1. Step 1: Write the proportion equation
   413,247 : 638,572.50 = 638,572.50 : x
2. Step 2: Convert to fraction form
   413,247/638,572.50 = 638,572.50/x
3. Step 3: Cross multiply
   413,247x = 638,572.50 × 638,572.50
4. Step 4: Simplify right side
   413,247x = 407,774,837,756.25
5. Step 5: Solve for x
   x = 407,774,837,756.25/413,247
6. Step 6: Final answer
   x = 986,758.13