Finding the Third Proportional to 350,685 and 501,442.50

Step by Step Solution

1. Step 1: Write the proportion equation
   350,685 : 501,442.50 = 501,442.50 : x
2. Step 2: Convert to fraction form
   350,685/501,442.50 = 501,442.50/x
3. Step 3: Cross multiply
   350,685x = 501,442.50 × 501,442.50
4. Step 4: Simplify right side
   350,685x = 251,444,580,806.25
5. Step 5: Solve for x
   x = 251,444,580,806.25/350,685
6. Step 6: Final answer
   x = 717,009.80