Finding the Third Proportional to 133,618 and 278,292.50

Step by Step Solution

1. Step 1: Write the proportion equation
   133,618 : 278,292.50 = 278,292.50 : x
2. Step 2: Convert to fraction form
   133,618/278,292.50 = 278,292.50/x
3. Step 3: Cross multiply
   133,618x = 278,292.50 × 278,292.50
4. Step 4: Simplify right side
   133,618x = 77,446,715,556.25
5. Step 5: Solve for x
   x = 77,446,715,556.25/133,618
6. Step 6: Final answer
   x = 579,612.89