Finding the Fourth Proportional to 530,508.72, 732,099.96 and 288,804.72

Step by Step Solution

1. Step 1: Write the proportion equation
   530,508.72 : 732,099.96 = 288,804.72 : x
2. Step 2: Convert to fraction form
   530,508.72/732,099.96 = 288,804.72/x
3. Step 3: Cross multiply
   530,508.72x = 732,099.96 × 288,804.72
4. Step 4: Simplify right side
   530,508.72x = 211,433,923,959.81
5. Step 5: Solve for x
   x = 211,433,923,959.81/530,508.72
6. Step 6: Final answer
   x = 398,549.38