Finding the Third Proportional to 140,389.50 and 300,075

Step by Step Solution

1. Step 1: Write the proportion equation
   140,389.50 : 300,075 = 300,075 : x
2. Step 2: Convert to fraction form
   140,389.50/300,075 = 300,075/x
3. Step 3: Cross multiply
   140,389.50x = 300,075 × 300,075
4. Step 4: Simplify right side
   140,389.50x = 90,045,005,625
5. Step 5: Solve for x
   x = 90,045,005,625/140,389.50
6. Step 6: Final answer
   x = 641,394.16