Finding the Third Proportional to 155,980 and 251,196

Step by Step Solution

1. Step 1: Write the proportion equation
   155,980 : 251,196 = 251,196 : x
2. Step 2: Convert to fraction form
   155,980/251,196 = 251,196/x
3. Step 3: Cross multiply
   155,980x = 251,196 × 251,196
4. Step 4: Simplify right side
   155,980x = 63,099,430,416
5. Step 5: Solve for x
   x = 63,099,430,416/155,980
6. Step 6: Final answer
   x = 404,535.39