Finding the Third Proportional to 145,251 and 318,498.75

Step by Step Solution

1. Step 1: Write the proportion equation
   145,251 : 318,498.75 = 318,498.75 : x
2. Step 2: Convert to fraction form
   145,251/318,498.75 = 318,498.75/x
3. Step 3: Cross multiply
   145,251x = 318,498.75 × 318,498.75
4. Step 4: Simplify right side
   145,251x = 101,441,453,751.56
5. Step 5: Solve for x
   x = 101,441,453,751.56/145,251
6. Step 6: Final answer
   x = 698,387.30