Finding the Third Proportional to 531,140 and 812,870

Step by Step Solution

1. Step 1: Write the proportion equation
   531,140 : 812,870 = 812,870 : x
2. Step 2: Convert to fraction form
   531,140/812,870 = 812,870/x
3. Step 3: Cross multiply
   531,140x = 812,870 × 812,870
4. Step 4: Simplify right side
   531,140x = 660,757,636,900
5. Step 5: Solve for x
   x = 660,757,636,900/531,140
6. Step 6: Final answer
   x = 1,244,036.67