Finding the Third Proportional to 257,581.50 and 553,251

Step by Step Solution

1. Step 1: Write the proportion equation
   257,581.50 : 553,251 = 553,251 : x
2. Step 2: Convert to fraction form
   257,581.50/553,251 = 553,251/x
3. Step 3: Cross multiply
   257,581.50x = 553,251 × 553,251
4. Step 4: Simplify right side
   257,581.50x = 306,086,669,001
5. Step 5: Solve for x
   x = 306,086,669,001/257,581.50
6. Step 6: Final answer
   x = 1,188,309.99