Finding the Third Proportional to 143,539.59 and 309,015

Step by Step Solution

1. Step 1: Write the proportion equation
   143,539.59 : 309,015 = 309,015 : x
2. Step 2: Convert to fraction form
   143,539.59/309,015 = 309,015/x
3. Step 3: Cross multiply
   143,539.59x = 309,015 × 309,015
4. Step 4: Simplify right side
   143,539.59x = 95,490,270,225
5. Step 5: Solve for x
   x = 95,490,270,225/143,539.59
6. Step 6: Final answer
   x = 665,253.87