Finding the Third Proportional to 311,857.50 and 656,316

Step by Step Solution

1. Step 1: Write the proportion equation
   311,857.50 : 656,316 = 656,316 : x
2. Step 2: Convert to fraction form
   311,857.50/656,316 = 656,316/x
3. Step 3: Cross multiply
   311,857.50x = 656,316 × 656,316
4. Step 4: Simplify right side
   311,857.50x = 430,750,691,856
5. Step 5: Solve for x
   x = 430,750,691,856/311,857.50
6. Step 6: Final answer
   x = 1,381,242.05