Finding the Third Proportional to 258,081.19 and 557,685

Step by Step Solution

1. Step 1: Write the proportion equation
   258,081.19 : 557,685 = 557,685 : x
2. Step 2: Convert to fraction form
   258,081.19/557,685 = 557,685/x
3. Step 3: Cross multiply
   258,081.19x = 557,685 × 557,685
4. Step 4: Simplify right side
   258,081.19x = 311,012,559,225
5. Step 5: Solve for x
   x = 311,012,559,225/258,081.19
6. Step 6: Final answer
   x = 1,205,095.82