Finding the Third Proportional to 143,454 and 315,216

Step by Step Solution

1. Step 1: Write the proportion equation
   143,454 : 315,216 = 315,216 : x
2. Step 2: Convert to fraction form
   143,454/315,216 = 315,216/x
3. Step 3: Cross multiply
   143,454x = 315,216 × 315,216
4. Step 4: Simplify right side
   143,454x = 99,361,126,656
5. Step 5: Solve for x
   x = 99,361,126,656/143,454
6. Step 6: Final answer
   x = 692,634.06