Finding the Third Proportional to 66,988 and 140,870

Step by Step Solution

1. Step 1: Write the proportion equation
   66,988 : 140,870 = 140,870 : x
2. Step 2: Convert to fraction form
   66,988/140,870 = 140,870/x
3. Step 3: Cross multiply
   66,988x = 140,870 × 140,870
4. Step 4: Simplify right side
   66,988x = 19,844,356,900
5. Step 5: Solve for x
   x = 19,844,356,900/66,988
6. Step 6: Final answer
   x = 296,237.49