Finding the Third Proportional to 240,370 and 556,443

Step by Step Solution

1. Step 1: Write the proportion equation
   240,370 : 556,443 = 556,443 : x
2. Step 2: Convert to fraction form
   240,370/556,443 = 556,443/x
3. Step 3: Cross multiply
   240,370x = 556,443 × 556,443
4. Step 4: Simplify right side
   240,370x = 309,628,812,249
5. Step 5: Solve for x
   x = 309,628,812,249/240,370
6. Step 6: Final answer
   x = 1,288,134.18