Finding the Third Proportional to 858,436 and 1,261,318

Step by Step Solution

1. Step 1: Write the proportion equation
   858,436 : 1,261,318 = 1,261,318 : x
2. Step 2: Convert to fraction form
   858,436/1,261,318 = 1,261,318/x
3. Step 3: Cross multiply
   858,436x = 1,261,318 × 1,261,318
4. Step 4: Simplify right side
   858,436x = 1,590,923,097,124
5. Step 5: Solve for x
   x = 1,590,923,097,124/858,436
6. Step 6: Final answer
   x = 1,853,280.96