Finding the Third Proportional to 419,139 and 663,979.50

Step by Step Solution

1. Step 1: Write the proportion equation
   419,139 : 663,979.50 = 663,979.50 : x
2. Step 2: Convert to fraction form
   419,139/663,979.50 = 663,979.50/x
3. Step 3: Cross multiply
   419,139x = 663,979.50 × 663,979.50
4. Step 4: Simplify right side
   419,139x = 440,868,776,420.25
5. Step 5: Solve for x
   x = 440,868,776,420.25/419,139
6. Step 6: Final answer
   x = 1,051,843.84