Finding the Third Proportional to 143,426 and 210,986

Step by Step Solution

1. Step 1: Write the proportion equation
   143,426 : 210,986 = 210,986 : x
2. Step 2: Convert to fraction form
   143,426/210,986 = 210,986/x
3. Step 3: Cross multiply
   143,426x = 210,986 × 210,986
4. Step 4: Simplify right side
   143,426x = 44,515,092,196
5. Step 5: Solve for x
   x = 44,515,092,196/143,426
6. Step 6: Final answer
   x = 310,369.75