Finding the Third Proportional to 647,358 and 990,745.50

Step by Step Solution

1. Step 1: Write the proportion equation
   647,358 : 990,745.50 = 990,745.50 : x
2. Step 2: Convert to fraction form
   647,358/990,745.50 = 990,745.50/x
3. Step 3: Cross multiply
   647,358x = 990,745.50 × 990,745.50
4. Step 4: Simplify right side
   647,358x = 981,576,645,770.25
5. Step 5: Solve for x
   x = 981,576,645,770.25/647,358
6. Step 6: Final answer
   x = 1,516,281.02