Finding the Third Proportional to 320,316 and 491,332.50

Step by Step Solution

1. Step 1: Write the proportion equation
   320,316 : 491,332.50 = 491,332.50 : x
2. Step 2: Convert to fraction form
   320,316/491,332.50 = 491,332.50/x
3. Step 3: Cross multiply
   320,316x = 491,332.50 × 491,332.50
4. Step 4: Simplify right side
   320,316x = 241,407,625,556.25
5. Step 5: Solve for x
   x = 241,407,625,556.25/320,316
6. Step 6: Final answer
   x = 753,654.60