Finding the Fourth Proportional to 462,951.30, 638,897.61 and 258,990.05

Step by Step Solution

1. Step 1: Write the proportion equation
   462,951.30 : 638,897.61 = 258,990.05 : x
2. Step 2: Convert to fraction form
   462,951.30/638,897.61 = 258,990.05/x
3. Step 3: Cross multiply
   462,951.30x = 638,897.61 × 258,990.05
4. Step 4: Simplify right side
   462,951.30x = 165,468,122,663.83
5. Step 5: Solve for x
   x = 165,468,122,663.83/462,951.30
6. Step 6: Final answer
   x = 357,420.15