Finding the Third Proportional to 143,188 and 210,398

Step by Step Solution

1. Step 1: Write the proportion equation
   143,188 : 210,398 = 210,398 : x
2. Step 2: Convert to fraction form
   143,188/210,398 = 210,398/x
3. Step 3: Cross multiply
   143,188x = 210,398 × 210,398
4. Step 4: Simplify right side
   143,188x = 44,267,318,404
5. Step 5: Solve for x
   x = 44,267,318,404/143,188
6. Step 6: Final answer
   x = 309,155.23