Finding the Third Proportional to 869,009 and 1,272,404

Step by Step Solution

1. Step 1: Write the proportion equation
   869,009 : 1,272,404 = 1,272,404 : x
2. Step 2: Convert to fraction form
   869,009/1,272,404 = 1,272,404/x
3. Step 3: Cross multiply
   869,009x = 1,272,404 × 1,272,404
4. Step 4: Simplify right side
   869,009x = 1,619,011,939,216
5. Step 5: Solve for x
   x = 1,619,011,939,216/869,009
6. Step 6: Final answer
   x = 1,863,055.43