Finding the Third Proportional to 140,359.50 and 287,280

Step by Step Solution

1. Step 1: Write the proportion equation
   140,359.50 : 287,280 = 287,280 : x
2. Step 2: Convert to fraction form
   140,359.50/287,280 = 287,280/x
3. Step 3: Cross multiply
   140,359.50x = 287,280 × 287,280
4. Step 4: Simplify right side
   140,359.50x = 82,529,798,400
5. Step 5: Solve for x
   x = 82,529,798,400/140,359.50
6. Step 6: Final answer
   x = 587,988.69