Finding the Third Proportional to 129,640.50 and 278,964

Step by Step Solution

1. Step 1: Write the proportion equation
   129,640.50 : 278,964 = 278,964 : x
2. Step 2: Convert to fraction form
   129,640.50/278,964 = 278,964/x
3. Step 3: Cross multiply
   129,640.50x = 278,964 × 278,964
4. Step 4: Simplify right side
   129,640.50x = 77,820,913,296
5. Step 5: Solve for x
   x = 77,820,913,296/129,640.50
6. Step 6: Final answer
   x = 600,282.42