Finding the Third Proportional to 155,680 and 329,870

Step by Step Solution

1. Step 1: Write the proportion equation
   155,680 : 329,870 = 329,870 : x
2. Step 2: Convert to fraction form
   155,680/329,870 = 329,870/x
3. Step 3: Cross multiply
   155,680x = 329,870 × 329,870
4. Step 4: Simplify right side
   155,680x = 108,814,216,900
5. Step 5: Solve for x
   x = 108,814,216,900/155,680
6. Step 6: Final answer
   x = 698,960.80