Finding the Third Proportional to 812,772 and 1,265,688

Step by Step Solution

1. Step 1: Write the proportion equation
   812,772 : 1,265,688 = 1,265,688 : x
2. Step 2: Convert to fraction form
   812,772/1,265,688 = 1,265,688/x
3. Step 3: Cross multiply
   812,772x = 1,265,688 × 1,265,688
4. Step 4: Simplify right side
   812,772x = 1,601,966,113,344
5. Step 5: Solve for x
   x = 1,601,966,113,344/812,772
6. Step 6: Final answer
   x = 1,970,990.77