Finding the Third Proportional to 89,415 and 189,490

Step by Step Solution

1. Step 1: Write the proportion equation
   89,415 : 189,490 = 189,490 : x
2. Step 2: Convert to fraction form
   89,415/189,490 = 189,490/x
3. Step 3: Cross multiply
   89,415x = 189,490 × 189,490
4. Step 4: Simplify right side
   89,415x = 35,906,460,100
5. Step 5: Solve for x
   x = 35,906,460,100/89,415
6. Step 6: Final answer
   x = 401,570.88