Finding the Third Proportional to 840,580 and 1,257,900

Step by Step Solution

1. Step 1: Write the proportion equation
   840,580 : 1,257,900 = 1,257,900 : x
2. Step 2: Convert to fraction form
   840,580/1,257,900 = 1,257,900/x
3. Step 3: Cross multiply
   840,580x = 1,257,900 × 1,257,900
4. Step 4: Simplify right side
   840,580x = 1,582,312,410,000
5. Step 5: Solve for x
   x = 1,582,312,410,000/840,580
6. Step 6: Final answer
   x = 1,882,405.49