Finding the Third Proportional to 815,364 and 1,918,503

Step by Step Solution

1. Step 1: Write the proportion equation
   815,364 : 1,918,503 = 1,918,503 : x
2. Step 2: Convert to fraction form
   815,364/1,918,503 = 1,918,503/x
3. Step 3: Cross multiply
   815,364x = 1,918,503 × 1,918,503
4. Step 4: Simplify right side
   815,364x = 3,680,653,761,009
5. Step 5: Solve for x
   x = 3,680,653,761,009/815,364
6. Step 6: Final answer
   x = 4,514,123.46