Finding the Third Proportional to 128,045.81 and 280,483.38

Step by Step Solution

1. Step 1: Write the proportion equation
   128,045.81 : 280,483.38 = 280,483.38 : x
2. Step 2: Convert to fraction form
   128,045.81/280,483.38 = 280,483.38/x
3. Step 3: Cross multiply
   128,045.81x = 280,483.38 × 280,483.38
4. Step 4: Simplify right side
   128,045.81x = 78,670,928,033.94
5. Step 5: Solve for x
   x = 78,670,928,033.94/128,045.81
6. Step 6: Final answer
   x = 614,396.73