Finding the Fourth Proportional to 384,499.96, 576,616.36 and 213,981.88

Step by Step Solution

1. Step 1: Write the proportion equation
   384,499.96 : 576,616.36 = 213,981.88 : x
2. Step 2: Convert to fraction form
   384,499.96/576,616.36 = 213,981.88/x
3. Step 3: Cross multiply
   384,499.96x = 576,616.36 × 213,981.88
4. Step 4: Simplify right side
   384,499.96x = 123,385,452,751.56
5. Step 5: Solve for x
   x = 123,385,452,751.56/384,499.96
6. Step 6: Final answer
   x = 320,898.48