Finding the Third Proportional to 129,042 and 277,856.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,042 : 277,856.50 = 277,856.50 : x
2. Step 2: Convert to fraction form
   129,042/277,856.50 = 277,856.50/x
3. Step 3: Cross multiply
   129,042x = 277,856.50 × 277,856.50
4. Step 4: Simplify right side
   129,042x = 77,204,234,592.25
5. Step 5: Solve for x
   x = 77,204,234,592.25/129,042
6. Step 6: Final answer
   x = 598,287.65