Finding the Third Proportional to 858,698 and 1,288,156

Step by Step Solution

1. Step 1: Write the proportion equation
   858,698 : 1,288,156 = 1,288,156 : x
2. Step 2: Convert to fraction form
   858,698/1,288,156 = 1,288,156/x
3. Step 3: Cross multiply
   858,698x = 1,288,156 × 1,288,156
4. Step 4: Simplify right side
   858,698x = 1,659,345,880,336
5. Step 5: Solve for x
   x = 1,659,345,880,336/858,698
6. Step 6: Final answer
   x = 1,932,397.51