Finding the Third Proportional to 143,111 and 210,290

Step by Step Solution

1. Step 1: Write the proportion equation
   143,111 : 210,290 = 210,290 : x
2. Step 2: Convert to fraction form
   143,111/210,290 = 210,290/x
3. Step 3: Cross multiply
   143,111x = 210,290 × 210,290
4. Step 4: Simplify right side
   143,111x = 44,221,884,100
5. Step 5: Solve for x
   x = 44,221,884,100/143,111
6. Step 6: Final answer
   x = 309,004.09