Finding the Fourth Proportional to 462,816.47, 638,745.89 and 258,878.72

Step by Step Solution

1. Step 1: Write the proportion equation
   462,816.47 : 638,745.89 = 258,878.72 : x
2. Step 2: Convert to fraction form
   462,816.47/638,745.89 = 258,878.72/x
3. Step 3: Cross multiply
   462,816.47x = 638,745.89 × 258,878.72
4. Step 4: Simplify right side
   462,816.47x = 165,357,713,920.34
5. Step 5: Solve for x
   x = 165,357,713,920.34/462,816.47
6. Step 6: Final answer
   x = 357,285.72