Finding the Third Proportional to 251,388 and 351,642.75

Step by Step Solution

1. Step 1: Write the proportion equation
   251,388 : 351,642.75 = 351,642.75 : x
2. Step 2: Convert to fraction form
   251,388/351,642.75 = 351,642.75/x
3. Step 3: Cross multiply
   251,388x = 351,642.75 × 351,642.75
4. Step 4: Simplify right side
   251,388x = 123,652,623,627.56
5. Step 5: Solve for x
   x = 123,652,623,627.56/251,388
6. Step 6: Final answer
   x = 491,879.58