Finding the Third Proportional to 1,919,378 and 4,200,340

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919,378 : 4,200,340 = 4,200,340 : x
2. Step 2: Convert to fraction form
   1,919,378/4,200,340 = 4,200,340/x
3. Step 3: Cross multiply
   1,919,378x = 4,200,340 × 4,200,340
4. Step 4: Simplify right side
   1,919,378x = 17,642,856,115,600
5. Step 5: Solve for x
   x = 17,642,856,115,600/1,919,378
6. Step 6: Final answer
   x = 9,191,965.37