Finding the Third Proportional to 256,107 and 558,870

Step by Step Solution

1. Step 1: Write the proportion equation
   256,107 : 558,870 = 558,870 : x
2. Step 2: Convert to fraction form
   256,107/558,870 = 558,870/x
3. Step 3: Cross multiply
   256,107x = 558,870 × 558,870
4. Step 4: Simplify right side
   256,107x = 312,335,676,900
5. Step 5: Solve for x
   x = 312,335,676,900/256,107
6. Step 6: Final answer
   x = 1,219,551.50