Finding the Fourth Proportional to 201,855.42, 278,559.15 and 111,209.31

Step by Step Solution

1. Step 1: Write the proportion equation
   201,855.42 : 278,559.15 = 111,209.31 : x
2. Step 2: Convert to fraction form
   201,855.42/278,559.15 = 111,209.31/x
3. Step 3: Cross multiply
   201,855.42x = 278,559.15 × 111,209.31
4. Step 4: Simplify right side
   201,855.42x = 30,978,370,865.69
5. Step 5: Solve for x
   x = 30,978,370,865.69/201,855.42
6. Step 6: Final answer
   x = 153,468.12