Finding the Third Proportional to 251,390 and 351,645.50

Step by Step Solution

1. Step 1: Write the proportion equation
   251,390 : 351,645.50 = 351,645.50 : x
2. Step 2: Convert to fraction form
   251,390/351,645.50 = 351,645.50/x
3. Step 3: Cross multiply
   251,390x = 351,645.50 × 351,645.50
4. Step 4: Simplify right side
   251,390x = 123,654,557,670.25
5. Step 5: Solve for x
   x = 123,654,557,670.25/251,390
6. Step 6: Final answer
   x = 491,883.36