Finding the Third Proportional to 130,978 and 285,940

Step by Step Solution

1. Step 1: Write the proportion equation
   130,978 : 285,940 = 285,940 : x
2. Step 2: Convert to fraction form
   130,978/285,940 = 285,940/x
3. Step 3: Cross multiply
   130,978x = 285,940 × 285,940
4. Step 4: Simplify right side
   130,978x = 81,761,683,600
5. Step 5: Solve for x
   x = 81,761,683,600/130,978
6. Step 6: Final answer
   x = 624,239.82