Finding the Third Proportional to 139,900.50 and 299,745.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,900.50 : 299,745.56 = 299,745.56 : x
2. Step 2: Convert to fraction form
   139,900.50/299,745.56 = 299,745.56/x
3. Step 3: Cross multiply
   139,900.50x = 299,745.56 × 299,745.56
4. Step 4: Simplify right side
   139,900.50x = 89,847,402,238.44
5. Step 5: Solve for x
   x = 89,847,402,238.44/139,900.50
6. Step 6: Final answer
   x = 642,223.60