Finding the Third Proportional to 359,187 and 479,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   359,187 : 479,290.50 = 479,290.50 : x
2. Step 2: Convert to fraction form
   359,187/479,290.50 = 479,290.50/x
3. Step 3: Cross multiply
   359,187x = 479,290.50 × 479,290.50
4. Step 4: Simplify right side
   359,187x = 229,719,383,390.25
5. Step 5: Solve for x
   x = 229,719,383,390.25/359,187
6. Step 6: Final answer
   x = 639,553.72