Finding the Third Proportional to 427,509 and 676,912.50

Step by Step Solution

1. Step 1: Write the proportion equation
   427,509 : 676,912.50 = 676,912.50 : x
2. Step 2: Convert to fraction form
   427,509/676,912.50 = 676,912.50/x
3. Step 3: Cross multiply
   427,509x = 676,912.50 × 676,912.50
4. Step 4: Simplify right side
   427,509x = 458,210,532,656.25
5. Step 5: Solve for x
   x = 458,210,532,656.25/427,509
6. Step 6: Final answer
   x = 1,071,814.94