Finding the Third Proportional to 316,678.50 and 491,418

Step by Step Solution

1. Step 1: Write the proportion equation
   316,678.50 : 491,418 = 491,418 : x
2. Step 2: Convert to fraction form
   316,678.50/491,418 = 491,418/x
3. Step 3: Cross multiply
   316,678.50x = 491,418 × 491,418
4. Step 4: Simplify right side
   316,678.50x = 241,491,650,724
5. Step 5: Solve for x
   x = 241,491,650,724/316,678.50
6. Step 6: Final answer
   x = 762,576.72