Finding the Third Proportional to 311,870 and 656,338

Step by Step Solution

1. Step 1: Write the proportion equation
   311,870 : 656,338 = 656,338 : x
2. Step 2: Convert to fraction form
   311,870/656,338 = 656,338/x
3. Step 3: Cross multiply
   311,870x = 656,338 × 656,338
4. Step 4: Simplify right side
   311,870x = 430,779,570,244
5. Step 5: Solve for x
   x = 430,779,570,244/311,870
6. Step 6: Final answer
   x = 1,381,279.28