Finding the Third Proportional to 257,039 and 556,978

Step by Step Solution

1. Step 1: Write the proportion equation
   257,039 : 556,978 = 556,978 : x
2. Step 2: Convert to fraction form
   257,039/556,978 = 556,978/x
3. Step 3: Cross multiply
   257,039x = 556,978 × 556,978
4. Step 4: Simplify right side
   257,039x = 310,224,492,484
5. Step 5: Solve for x
   x = 310,224,492,484/257,039
6. Step 6: Final answer
   x = 1,206,916.04