Finding the Fourth Proportional to 554,870.48, 765,721.17 and 300,221.69

Step by Step Solution

1. Step 1: Write the proportion equation
   554,870.48 : 765,721.17 = 300,221.69 : x
2. Step 2: Convert to fraction form
   554,870.48/765,721.17 = 300,221.69/x
3. Step 3: Cross multiply
   554,870.48x = 765,721.17 × 300,221.69
4. Step 4: Simplify right side
   554,870.48x = 229,886,099,897.57
5. Step 5: Solve for x
   x = 229,886,099,897.57/554,870.48
6. Step 6: Final answer
   x = 414,305.88