Finding the Third Proportional to 840,516 and 1,291,870

Step by Step Solution

1. Step 1: Write the proportion equation
   840,516 : 1,291,870 = 1,291,870 : x
2. Step 2: Convert to fraction form
   840,516/1,291,870 = 1,291,870/x
3. Step 3: Cross multiply
   840,516x = 1,291,870 × 1,291,870
4. Step 4: Simplify right side
   840,516x = 1,668,928,096,900
5. Step 5: Solve for x
   x = 1,668,928,096,900/840,516
6. Step 6: Final answer
   x = 1,985,599.44