Finding the Third Proportional to 299,730 and 641,971.50

Step by Step Solution

1. Step 1: Write the proportion equation
   299,730 : 641,971.50 = 641,971.50 : x
2. Step 2: Convert to fraction form
   299,730/641,971.50 = 641,971.50/x
3. Step 3: Cross multiply
   299,730x = 641,971.50 × 641,971.50
4. Step 4: Simplify right side
   299,730x = 412,127,406,812.25
5. Step 5: Solve for x
   x = 412,127,406,812.25/299,730
6. Step 6: Final answer
   x = 1,374,995.52