Finding the Third Proportional to 143,308 and 309,964

Step by Step Solution

1. Step 1: Write the proportion equation
   143,308 : 309,964 = 309,964 : x
2. Step 2: Convert to fraction form
   143,308/309,964 = 309,964/x
3. Step 3: Cross multiply
   143,308x = 309,964 × 309,964
4. Step 4: Simplify right side
   143,308x = 96,077,681,296
5. Step 5: Solve for x
   x = 96,077,681,296/143,308
6. Step 6: Final answer
   x = 670,427.90