Finding the Fourth Proportional to 282,147.12, 389,362.80 and 154,830.72

Step by Step Solution

1. Step 1: Write the proportion equation
   282,147.12 : 389,362.80 = 154,830.72 : x
2. Step 2: Convert to fraction form
   282,147.12/389,362.80 = 154,830.72/x
3. Step 3: Cross multiply
   282,147.12x = 389,362.80 × 154,830.72
4. Step 4: Simplify right side
   282,147.12x = 60,285,322,665.22
5. Step 5: Solve for x
   x = 60,285,322,665.22/282,147.12
6. Step 6: Final answer
   x = 213,666.27