Finding the Third Proportional to 259,245 and 423,322.50

Step by Step Solution

1. Step 1: Write the proportion equation
   259,245 : 423,322.50 = 423,322.50 : x
2. Step 2: Convert to fraction form
   259,245/423,322.50 = 423,322.50/x
3. Step 3: Cross multiply
   259,245x = 423,322.50 × 423,322.50
4. Step 4: Simplify right side
   259,245x = 179,201,939,006.25
5. Step 5: Solve for x
   x = 179,201,939,006.25/259,245
6. Step 6: Final answer
   x = 691,245.50