Finding the Third Proportional to 315,449.75 and 684,139

Step by Step Solution

1. Step 1: Write the proportion equation
   315,449.75 : 684,139 = 684,139 : x
2. Step 2: Convert to fraction form
   315,449.75/684,139 = 684,139/x
3. Step 3: Cross multiply
   315,449.75x = 684,139 × 684,139
4. Step 4: Simplify right side
   315,449.75x = 468,046,171,321
5. Step 5: Solve for x
   x = 468,046,171,321/315,449.75
6. Step 6: Final answer
   x = 1,483,742.41