Finding the Third Proportional to 155,978 and 319,348.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,978 : 319,348.50 = 319,348.50 : x
2. Step 2: Convert to fraction form
   155,978/319,348.50 = 319,348.50/x
3. Step 3: Cross multiply
   155,978x = 319,348.50 × 319,348.50
4. Step 4: Simplify right side
   155,978x = 101,983,464,452.25
5. Step 5: Solve for x
   x = 101,983,464,452.25/155,978
6. Step 6: Final answer
   x = 653,832.36