Finding the Third Proportional to 143,345 and 215,072

Step by Step Solution

1. Step 1: Write the proportion equation
   143,345 : 215,072 = 215,072 : x
2. Step 2: Convert to fraction form
   143,345/215,072 = 215,072/x
3. Step 3: Cross multiply
   143,345x = 215,072 × 215,072
4. Step 4: Simplify right side
   143,345x = 46,255,965,184
5. Step 5: Solve for x
   x = 46,255,965,184/143,345
6. Step 6: Final answer
   x = 322,689.77