Finding the Third Proportional to 139,418.50 and 299,075

Step by Step Solution

1. Step 1: Write the proportion equation
   139,418.50 : 299,075 = 299,075 : x
2. Step 2: Convert to fraction form
   139,418.50/299,075 = 299,075/x
3. Step 3: Cross multiply
   139,418.50x = 299,075 × 299,075
4. Step 4: Simplify right side
   139,418.50x = 89,445,855,625
5. Step 5: Solve for x
   x = 89,445,855,625/139,418.50
6. Step 6: Final answer
   x = 641,563.75