Finding the Third Proportional to 89,820 and 140,490

Step by Step Solution

1. Step 1: Write the proportion equation
   89,820 : 140,490 = 140,490 : x
2. Step 2: Convert to fraction form
   89,820/140,490 = 140,490/x
3. Step 3: Cross multiply
   89,820x = 140,490 × 140,490
4. Step 4: Simplify right side
   89,820x = 19,737,440,100
5. Step 5: Solve for x
   x = 19,737,440,100/89,820
6. Step 6: Final answer
   x = 219,744.38