Finding the Third Proportional to 143,072 and 212,916

Step by Step Solution

1. Step 1: Write the proportion equation
   143,072 : 212,916 = 212,916 : x
2. Step 2: Convert to fraction form
   143,072/212,916 = 212,916/x
3. Step 3: Cross multiply
   143,072x = 212,916 × 212,916
4. Step 4: Simplify right side
   143,072x = 45,333,223,056
5. Step 5: Solve for x
   x = 45,333,223,056/143,072
6. Step 6: Final answer
   x = 316,856.01