Finding the Fourth Proportional to 401,786.83, 554,429.16 and 238,415.18

Step by Step Solution

1. Step 1: Write the proportion equation
   401,786.83 : 554,429.16 = 238,415.18 : x
2. Step 2: Convert to fraction form
   401,786.83/554,429.16 = 238,415.18/x
3. Step 3: Cross multiply
   401,786.83x = 554,429.16 × 238,415.18
4. Step 4: Simplify right side
   401,786.83x = 132,184,327,978.65
5. Step 5: Solve for x
   x = 132,184,327,978.65/401,786.83
6. Step 6: Final answer
   x = 328,991.19