Finding the Third Proportional to 143,139 and 310,942.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,139 : 310,942.50 = 310,942.50 : x
2. Step 2: Convert to fraction form
   143,139/310,942.50 = 310,942.50/x
3. Step 3: Cross multiply
   143,139x = 310,942.50 × 310,942.50
4. Step 4: Simplify right side
   143,139x = 96,685,238,306.25
5. Step 5: Solve for x
   x = 96,685,238,306.25/143,139
6. Step 6: Final answer
   x = 675,463.98