Finding the Third Proportional to 256,819.50 and 553,167

Step by Step Solution

1. Step 1: Write the proportion equation
   256,819.50 : 553,167 = 553,167 : x
2. Step 2: Convert to fraction form
   256,819.50/553,167 = 553,167/x
3. Step 3: Cross multiply
   256,819.50x = 553,167 × 553,167
4. Step 4: Simplify right side
   256,819.50x = 305,993,729,889
5. Step 5: Solve for x
   x = 305,993,729,889/256,819.50
6. Step 6: Final answer
   x = 1,191,473.89