Finding the Third Proportional to 143,270 and 311,415.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,270 : 311,415.50 = 311,415.50 : x
2. Step 2: Convert to fraction form
   143,270/311,415.50 = 311,415.50/x
3. Step 3: Cross multiply
   143,270x = 311,415.50 × 311,415.50
4. Step 4: Simplify right side
   143,270x = 96,979,613,640.25
5. Step 5: Solve for x
   x = 96,979,613,640.25/143,270
6. Step 6: Final answer
   x = 676,901.05