Finding the Third Proportional to 301,815 and 639,607.50

Step by Step Solution

1. Step 1: Write the proportion equation
   301,815 : 639,607.50 = 639,607.50 : x
2. Step 2: Convert to fraction form
   301,815/639,607.50 = 639,607.50/x
3. Step 3: Cross multiply
   301,815x = 639,607.50 × 639,607.50
4. Step 4: Simplify right side
   301,815x = 409,097,754,056.25
5. Step 5: Solve for x
   x = 409,097,754,056.25/301,815
6. Step 6: Final answer
   x = 1,355,458.66