Finding the Fourth Proportional to 401,528.88, 554,105.16 and 217,764.72

Step by Step Solution

1. Step 1: Write the proportion equation
   401,528.88 : 554,105.16 = 217,764.72 : x
2. Step 2: Convert to fraction form
   401,528.88/554,105.16 = 217,764.72/x
3. Step 3: Cross multiply
   401,528.88x = 554,105.16 × 217,764.72
4. Step 4: Simplify right side
   401,528.88x = 120,664,555,017.96
5. Step 5: Solve for x
   x = 120,664,555,017.96/401,528.88
6. Step 6: Final answer
   x = 300,512.77