Finding the Third Proportional to 282,720 and 615,300

Step by Step Solution

1. Step 1: Write the proportion equation
   282,720 : 615,300 = 615,300 : x
2. Step 2: Convert to fraction form
   282,720/615,300 = 615,300/x
3. Step 3: Cross multiply
   282,720x = 615,300 × 615,300
4. Step 4: Simplify right side
   282,720x = 378,594,090,000
5. Step 5: Solve for x
   x = 378,594,090,000/282,720
6. Step 6: Final answer
   x = 1,339,113.22