Finding the Third Proportional to 300,139 and 708,490

Step by Step Solution

1. Step 1: Write the proportion equation
   300,139 : 708,490 = 708,490 : x
2. Step 2: Convert to fraction form
   300,139/708,490 = 708,490/x
3. Step 3: Cross multiply
   300,139x = 708,490 × 708,490
4. Step 4: Simplify right side
   300,139x = 501,958,080,100
5. Step 5: Solve for x
   x = 501,958,080,100/300,139
6. Step 6: Final answer
   x = 1,672,418.71