Finding the Fourth Proportional to 401,066.56, 553,723.52 and 258,075.10

Step by Step Solution

1. Step 1: Write the proportion equation
   401,066.56 : 553,723.52 = 258,075.10 : x
2. Step 2: Convert to fraction form
   401,066.56/553,723.52 = 258,075.10/x
3. Step 3: Cross multiply
   401,066.56x = 553,723.52 × 258,075.10
4. Step 4: Simplify right side
   401,066.56x = 142,902,252,796.35
5. Step 5: Solve for x
   x = 142,902,252,796.35/401,066.56
6. Step 6: Final answer
   x = 356,305.58