Finding the Third Proportional to 115,420 and 173,890

Step by Step Solution

1. Step 1: Write the proportion equation
   115,420 : 173,890 = 173,890 : x
2. Step 2: Convert to fraction form
   115,420/173,890 = 173,890/x
3. Step 3: Cross multiply
   115,420x = 173,890 × 173,890
4. Step 4: Simplify right side
   115,420x = 30,237,732,100
5. Step 5: Solve for x
   x = 30,237,732,100/115,420
6. Step 6: Final answer
   x = 261,980.00