Finding the Third Proportional to 256,530 and 556,861.50

Step by Step Solution

1. Step 1: Write the proportion equation
   256,530 : 556,861.50 = 556,861.50 : x
2. Step 2: Convert to fraction form
   256,530/556,861.50 = 556,861.50/x
3. Step 3: Cross multiply
   256,530x = 556,861.50 × 556,861.50
4. Step 4: Simplify right side
   256,530x = 310,094,730,182.25
5. Step 5: Solve for x
   x = 310,094,730,182.25/256,530
6. Step 6: Final answer
   x = 1,208,804.94