Finding the Third Proportional to 917,866 and 1,290,274

Step by Step Solution

1. Step 1: Write the proportion equation
   917,866 : 1,290,274 = 1,290,274 : x
2. Step 2: Convert to fraction form
   917,866/1,290,274 = 1,290,274/x
3. Step 3: Cross multiply
   917,866x = 1,290,274 × 1,290,274
4. Step 4: Simplify right side
   917,866x = 1,664,806,995,076
5. Step 5: Solve for x
   x = 1,664,806,995,076/917,866
6. Step 6: Final answer
   x = 1,813,780.00