Finding the Third Proportional to 1,215,144 and 2,659,139

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,144 : 2,659,139 = 2,659,139 : x
2. Step 2: Convert to fraction form
   1,215,144/2,659,139 = 2,659,139/x
3. Step 3: Cross multiply
   1,215,144x = 2,659,139 × 2,659,139
4. Step 4: Simplify right side
   1,215,144x = 7,071,020,221,321
5. Step 5: Solve for x
   x = 7,071,020,221,321/1,215,144
6. Step 6: Final answer
   x = 5,819,080.06