Finding the Third Proportional to 407,358 and 617,809.50

Step by Step Solution

1. Step 1: Write the proportion equation
   407,358 : 617,809.50 = 617,809.50 : x
2. Step 2: Convert to fraction form
   407,358/617,809.50 = 617,809.50/x
3. Step 3: Cross multiply
   407,358x = 617,809.50 × 617,809.50
4. Step 4: Simplify right side
   407,358x = 381,688,578,290.25
5. Step 5: Solve for x
   x = 381,688,578,290.25/407,358
6. Step 6: Final answer
   x = 936,985.60