Finding the Third Proportional to 859,322 and 1,288,387

Step by Step Solution

1. Step 1: Write the proportion equation
   859,322 : 1,288,387 = 1,288,387 : x
2. Step 2: Convert to fraction form
   859,322/1,288,387 = 1,288,387/x
3. Step 3: Cross multiply
   859,322x = 1,288,387 × 1,288,387
4. Step 4: Simplify right side
   859,322x = 1,659,941,061,769
5. Step 5: Solve for x
   x = 1,659,941,061,769/859,322
6. Step 6: Final answer
   x = 1,931,686.91