Finding the Third Proportional to 318,141 and 686,095.50

Step by Step Solution

1. Step 1: Write the proportion equation
   318,141 : 686,095.50 = 686,095.50 : x
2. Step 2: Convert to fraction form
   318,141/686,095.50 = 686,095.50/x
3. Step 3: Cross multiply
   318,141x = 686,095.50 × 686,095.50
4. Step 4: Simplify right side
   318,141x = 470,727,035,120.25
5. Step 5: Solve for x
   x = 470,727,035,120.25/318,141
6. Step 6: Final answer
   x = 1,479,617.64