Finding the Third Proportional to 147,181.50 and 317,880

Step by Step Solution

1. Step 1: Write the proportion equation
   147,181.50 : 317,880 = 317,880 : x
2. Step 2: Convert to fraction form
   147,181.50/317,880 = 317,880/x
3. Step 3: Cross multiply
   147,181.50x = 317,880 × 317,880
4. Step 4: Simplify right side
   147,181.50x = 101,047,694,400
5. Step 5: Solve for x
   x = 101,047,694,400/147,181.50
6. Step 6: Final answer
   x = 686,551.60