Finding the Third Proportional to 858,434 and 1,261,315

Step by Step Solution

1. Step 1: Write the proportion equation
   858,434 : 1,261,315 = 1,261,315 : x
2. Step 2: Convert to fraction form
   858,434/1,261,315 = 1,261,315/x
3. Step 3: Cross multiply
   858,434x = 1,261,315 × 1,261,315
4. Step 4: Simplify right side
   858,434x = 1,590,915,529,225
5. Step 5: Solve for x
   x = 1,590,915,529,225/858,434
6. Step 6: Final answer
   x = 1,853,276.47