Finding the Third Proportional to 917,748 and 1,290,087

Step by Step Solution

1. Step 1: Write the proportion equation
   917,748 : 1,290,087 = 1,290,087 : x
2. Step 2: Convert to fraction form
   917,748/1,290,087 = 1,290,087/x
3. Step 3: Cross multiply
   917,748x = 1,290,087 × 1,290,087
4. Step 4: Simplify right side
   917,748x = 1,664,324,467,569
5. Step 5: Solve for x
   x = 1,664,324,467,569/917,748
6. Step 6: Final answer
   x = 1,813,487.44