Finding the Third Proportional to 865,200 and 1,290,624

Step by Step Solution

1. Step 1: Write the proportion equation
   865,200 : 1,290,624 = 1,290,624 : x
2. Step 2: Convert to fraction form
   865,200/1,290,624 = 1,290,624/x
3. Step 3: Cross multiply
   865,200x = 1,290,624 × 1,290,624
4. Step 4: Simplify right side
   865,200x = 1,665,710,309,376
5. Step 5: Solve for x
   x = 1,665,710,309,376/865,200
6. Step 6: Final answer
   x = 1,925,231.52