Finding the Third Proportional to 1,278,684 and 2,130,840

Step by Step Solution

1. Step 1: Write the proportion equation
   1,278,684 : 2,130,840 = 2,130,840 : x
2. Step 2: Convert to fraction form
   1,278,684/2,130,840 = 2,130,840/x
3. Step 3: Cross multiply
   1,278,684x = 2,130,840 × 2,130,840
4. Step 4: Simplify right side
   1,278,684x = 4,540,479,105,600
5. Step 5: Solve for x
   x = 4,540,479,105,600/1,278,684
6. Step 6: Final answer
   x = 3,550,900.07