Finding the Third Proportional to 143,980.50 and 314,164.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,980.50 : 314,164.50 = 314,164.50 : x
2. Step 2: Convert to fraction form
   143,980.50/314,164.50 = 314,164.50/x
3. Step 3: Cross multiply
   143,980.50x = 314,164.50 × 314,164.50
4. Step 4: Simplify right side
   143,980.50x = 98,699,333,060.25
5. Step 5: Solve for x
   x = 98,699,333,060.25/143,980.50
6. Step 6: Final answer
   x = 685,504.86