Finding the Fourth Proportional to 401,510.72, 554,087.52 and 220,223.95

Step by Step Solution

1. Step 1: Write the proportion equation
   401,510.72 : 554,087.52 = 220,223.95 : x
2. Step 2: Convert to fraction form
   401,510.72/554,087.52 = 220,223.95/x
3. Step 3: Cross multiply
   401,510.72x = 554,087.52 × 220,223.95
4. Step 4: Simplify right side
   401,510.72x = 122,023,340,914.89
5. Step 5: Solve for x
   x = 122,023,340,914.89/401,510.72
6. Step 6: Final answer
   x = 303,910.54