Finding the Third Proportional to 301,811.06 and 639,601.31

Step by Step Solution

1. Step 1: Write the proportion equation
   301,811.06 : 639,601.31 = 639,601.31 : x
2. Step 2: Convert to fraction form
   301,811.06/639,601.31 = 639,601.31/x
3. Step 3: Cross multiply
   301,811.06x = 639,601.31 × 639,601.31
4. Step 4: Simplify right side
   301,811.06x = 409,089,838,951.72
5. Step 5: Solve for x
   x = 409,089,838,951.72/301,811.06
6. Step 6: Final answer
   x = 1,355,450.11