Finding the Third Proportional to 311,901 and 656,395.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,901 : 656,395.50 = 656,395.50 : x
2. Step 2: Convert to fraction form
   311,901/656,395.50 = 656,395.50/x
3. Step 3: Cross multiply
   311,901x = 656,395.50 × 656,395.50
4. Step 4: Simplify right side
   311,901x = 430,855,052,420.25
5. Step 5: Solve for x
   x = 430,855,052,420.25/311,901
6. Step 6: Final answer
   x = 1,381,384.00