Finding the Third Proportional to 905,378 and 1,991,540

Step by Step Solution

1. Step 1: Write the proportion equation
   905,378 : 1,991,540 = 1,991,540 : x
2. Step 2: Convert to fraction form
   905,378/1,991,540 = 1,991,540/x
3. Step 3: Cross multiply
   905,378x = 1,991,540 × 1,991,540
4. Step 4: Simplify right side
   905,378x = 3,966,231,571,600
5. Step 5: Solve for x
   x = 3,966,231,571,600/905,378
6. Step 6: Final answer
   x = 4,380,746.57