Finding the Third Proportional to 147,087 and 317,497.50

Step by Step Solution

1. Step 1: Write the proportion equation
   147,087 : 317,497.50 = 317,497.50 : x
2. Step 2: Convert to fraction form
   147,087/317,497.50 = 317,497.50/x
3. Step 3: Cross multiply
   147,087x = 317,497.50 × 317,497.50
4. Step 4: Simplify right side
   147,087x = 100,804,662,506.25
5. Step 5: Solve for x
   x = 100,804,662,506.25/147,087
6. Step 6: Final answer
   x = 685,340.39