Finding the Third Proportional to 143,478 and 314,970

Step by Step Solution

1. Step 1: Write the proportion equation
   143,478 : 314,970 = 314,970 : x
2. Step 2: Convert to fraction form
   143,478/314,970 = 314,970/x
3. Step 3: Cross multiply
   143,478x = 314,970 × 314,970
4. Step 4: Simplify right side
   143,478x = 99,206,100,900
5. Step 5: Solve for x
   x = 99,206,100,900/143,478
6. Step 6: Final answer
   x = 691,437.72