Finding the Third Proportional to 256,499.50 and 556,808

Step by Step Solution

1. Step 1: Write the proportion equation
   256,499.50 : 556,808 = 556,808 : x
2. Step 2: Convert to fraction form
   256,499.50/556,808 = 556,808/x
3. Step 3: Cross multiply
   256,499.50x = 556,808 × 556,808
4. Step 4: Simplify right side
   256,499.50x = 310,035,148,864
5. Step 5: Solve for x
   x = 310,035,148,864/256,499.50
6. Step 6: Final answer
   x = 1,208,716.39