Finding the Third Proportional to 858,265 and 1,261,123

Step by Step Solution

1. Step 1: Write the proportion equation
   858,265 : 1,261,123 = 1,261,123 : x
2. Step 2: Convert to fraction form
   858,265/1,261,123 = 1,261,123/x
3. Step 3: Cross multiply
   858,265x = 1,261,123 × 1,261,123
4. Step 4: Simplify right side
   858,265x = 1,590,431,221,129
5. Step 5: Solve for x
   x = 1,590,431,221,129/858,265
6. Step 6: Final answer
   x = 1,853,077.10