Finding the Third Proportional to 149,275.50 and 315,399

Step by Step Solution

1. Step 1: Write the proportion equation
   149,275.50 : 315,399 = 315,399 : x
2. Step 2: Convert to fraction form
   149,275.50/315,399 = 315,399/x
3. Step 3: Cross multiply
   149,275.50x = 315,399 × 315,399
4. Step 4: Simplify right side
   149,275.50x = 99,476,529,201
5. Step 5: Solve for x
   x = 99,476,529,201/149,275.50
6. Step 6: Final answer
   x = 666,395.55