Finding the Third Proportional to 210,118 and 315,392

Step by Step Solution

1. Step 1: Write the proportion equation
   210,118 : 315,392 = 315,392 : x
2. Step 2: Convert to fraction form
   210,118/315,392 = 315,392/x
3. Step 3: Cross multiply
   210,118x = 315,392 × 315,392
4. Step 4: Simplify right side
   210,118x = 99,472,113,664
5. Step 5: Solve for x
   x = 99,472,113,664/210,118
6. Step 6: Final answer
   x = 473,410.72