Finding the Third Proportional to 858,269 and 1,261,128

Step by Step Solution

1. Step 1: Write the proportion equation
   858,269 : 1,261,128 = 1,261,128 : x
2. Step 2: Convert to fraction form
   858,269/1,261,128 = 1,261,128/x
3. Step 3: Cross multiply
   858,269x = 1,261,128 × 1,261,128
4. Step 4: Simplify right side
   858,269x = 1,590,443,832,384
5. Step 5: Solve for x
   x = 1,590,443,832,384/858,269
6. Step 6: Final answer
   x = 1,853,083.16