Finding the Fourth Proportional to 530,510.72, 732,102.72 and 288,806.72

Step by Step Solution

1. Step 1: Write the proportion equation
   530,510.72 : 732,102.72 = 288,806.72 : x
2. Step 2: Convert to fraction form
   530,510.72/732,102.72 = 288,806.72/x
3. Step 3: Cross multiply
   530,510.72x = 732,102.72 × 288,806.72
4. Step 4: Simplify right side
   530,510.72x = 211,436,185,266.28
5. Step 5: Solve for x
   x = 211,436,185,266.28/530,510.72
6. Step 6: Final answer
   x = 398,552.14