Finding the Fourth Proportional to 245,980.50, 338,738.46 and 213,700.38

Step by Step Solution

1. Step 1: Write the proportion equation
   245,980.50 : 338,738.46 = 213,700.38 : x
2. Step 2: Convert to fraction form
   245,980.50/338,738.46 = 213,700.38/x
3. Step 3: Cross multiply
   245,980.50x = 338,738.46 × 213,700.38
4. Step 4: Simplify right side
   245,980.50x = 72,388,537,622.61
5. Step 5: Solve for x
   x = 72,388,537,622.61/245,980.50
6. Step 6: Final answer
   x = 294,285.68