Finding the Fourth Proportional to 530,488.72, 732,072.36 and 288,784.72

Step by Step Solution

1. Step 1: Write the proportion equation
   530,488.72 : 732,072.36 = 288,784.72 : x
2. Step 2: Convert to fraction form
   530,488.72/732,072.36 = 288,784.72/x
3. Step 3: Cross multiply
   530,488.72x = 732,072.36 × 288,784.72
4. Step 4: Simplify right side
   530,488.72x = 211,411,311,502.34
5. Step 5: Solve for x
   x = 211,411,311,502.34/530,488.72
6. Step 6: Final answer
   x = 398,521.78