Finding the Third Proportional to 648,172 and 981,213

Step by Step Solution

1. Step 1: Write the proportion equation
   648,172 : 981,213 = 981,213 : x
2. Step 2: Convert to fraction form
   648,172/981,213 = 981,213/x
3. Step 3: Cross multiply
   648,172x = 981,213 × 981,213
4. Step 4: Simplify right side
   648,172x = 962,778,951,369
5. Step 5: Solve for x
   x = 962,778,951,369/648,172
6. Step 6: Final answer
   x = 1,485,375.72