Finding the Third Proportional to 1,407,142 and 3,318,431

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407,142 : 3,318,431 = 3,318,431 : x
2. Step 2: Convert to fraction form
   1,407,142/3,318,431 = 3,318,431/x
3. Step 3: Cross multiply
   1,407,142x = 3,318,431 × 3,318,431
4. Step 4: Simplify right side
   1,407,142x = 11,011,984,301,761
5. Step 5: Solve for x
   x = 11,011,984,301,761/1,407,142
6. Step 6: Final answer
   x = 7,825,780.41