Finding the Third Proportional to 143,199 and 210,414

Step by Step Solution

1. Step 1: Write the proportion equation
   143,199 : 210,414 = 210,414 : x
2. Step 2: Convert to fraction form
   143,199/210,414 = 210,414/x
3. Step 3: Cross multiply
   143,199x = 210,414 × 210,414
4. Step 4: Simplify right side
   143,199x = 44,274,051,396
5. Step 5: Solve for x
   x = 44,274,051,396/143,199
6. Step 6: Final answer
   x = 309,178.50