Finding the Third Proportional to 258,904.69 and 553,792.78

Step by Step Solution

1. Step 1: Write the proportion equation
   258,904.69 : 553,792.78 = 553,792.78 : x
2. Step 2: Convert to fraction form
   258,904.69/553,792.78 = 553,792.78/x
3. Step 3: Cross multiply
   258,904.69x = 553,792.78 × 553,792.78
4. Step 4: Simplify right side
   258,904.69x = 306,686,444,564.61
5. Step 5: Solve for x
   x = 306,686,444,564.61/258,904.69
6. Step 6: Final answer
   x = 1,184,553.46