Finding the Third Proportional to 900,218 and 1,380,390

Step by Step Solution

1. Step 1: Write the proportion equation
   900,218 : 1,380,390 = 1,380,390 : x
2. Step 2: Convert to fraction form
   900,218/1,380,390 = 1,380,390/x
3. Step 3: Cross multiply
   900,218x = 1,380,390 × 1,380,390
4. Step 4: Simplify right side
   900,218x = 1,905,476,552,100
5. Step 5: Solve for x
   x = 1,905,476,552,100/900,218
6. Step 6: Final answer
   x = 2,116,683.46