Finding the Third Proportional to 308,325 and 686,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   308,325 : 686,719.50 = 686,719.50 : x
2. Step 2: Convert to fraction form
   308,325/686,719.50 = 686,719.50/x
3. Step 3: Cross multiply
   308,325x = 686,719.50 × 686,719.50
4. Step 4: Simplify right side
   308,325x = 471,583,671,680.25
5. Step 5: Solve for x
   x = 471,583,671,680.25/308,325
6. Step 6: Final answer
   x = 1,529,501.89