Finding the Third Proportional to 306,636 and 429,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   306,636 : 429,688.50 = 429,688.50 : x
2. Step 2: Convert to fraction form
   306,636/429,688.50 = 429,688.50/x
3. Step 3: Cross multiply
   306,636x = 429,688.50 × 429,688.50
4. Step 4: Simplify right side
   306,636x = 184,632,207,032.25
5. Step 5: Solve for x
   x = 184,632,207,032.25/306,636
6. Step 6: Final answer
   x = 602,121.76