Finding the Fourth Proportional to 223,911.50, 335,078.42 and 139,711.30

Step by Step Solution

1. Step 1: Write the proportion equation
   223,911.50 : 335,078.42 = 139,711.30 : x
2. Step 2: Convert to fraction form
   223,911.50/335,078.42 = 139,711.30/x
3. Step 3: Cross multiply
   223,911.50x = 335,078.42 × 139,711.30
4. Step 4: Simplify right side
   223,911.50x = 46,814,240,123.89
5. Step 5: Solve for x
   x = 46,814,240,123.89/223,911.50
6. Step 6: Final answer
   x = 209,074.75