Finding the Third Proportional to 245,676 and 389,533.50

Step by Step Solution

1. Step 1: Write the proportion equation
   245,676 : 389,533.50 = 389,533.50 : x
2. Step 2: Convert to fraction form
   245,676/389,533.50 = 389,533.50/x
3. Step 3: Cross multiply
   245,676x = 389,533.50 × 389,533.50
4. Step 4: Simplify right side
   245,676x = 151,736,347,622.25
5. Step 5: Solve for x
   x = 151,736,347,622.25/245,676
6. Step 6: Final answer
   x = 617,627.88