Finding the Third Proportional to 310,889 and 456,132.50

Step by Step Solution

1. Step 1: Write the proportion equation
   310,889 : 456,132.50 = 456,132.50 : x
2. Step 2: Convert to fraction form
   310,889/456,132.50 = 456,132.50/x
3. Step 3: Cross multiply
   310,889x = 456,132.50 × 456,132.50
4. Step 4: Simplify right side
   310,889x = 208,056,857,556.25
5. Step 5: Solve for x
   x = 208,056,857,556.25/310,889
6. Step 6: Final answer
   x = 669,231.97