Finding the Third Proportional to 143,172 and 210,384

Step by Step Solution

1. Step 1: Write the proportion equation
   143,172 : 210,384 = 210,384 : x
2. Step 2: Convert to fraction form
   143,172/210,384 = 210,384/x
3. Step 3: Cross multiply
   143,172x = 210,384 × 210,384
4. Step 4: Simplify right side
   143,172x = 44,261,427,456
5. Step 5: Solve for x
   x = 44,261,427,456/143,172
6. Step 6: Final answer
   x = 309,148.63