Finding the Fourth Proportional to 201,728.72, 278,387.68 and 111,093.12

Step by Step Solution

1. Step 1: Write the proportion equation
   201,728.72 : 278,387.68 = 111,093.12 : x
2. Step 2: Convert to fraction form
   201,728.72/278,387.68 = 111,093.12/x
3. Step 3: Cross multiply
   201,728.72x = 278,387.68 × 111,093.12
4. Step 4: Simplify right side
   201,728.72x = 30,926,955,940.76
5. Step 5: Solve for x
   x = 30,926,955,940.76/201,728.72
6. Step 6: Final answer
   x = 153,309.63