Finding the Fourth Proportional to 12,357.50, 17,047.42 and 11,880.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,357.50 : 17,047.42 = 11,880.09 : x
2. Step 2: Convert to fraction form
   12,357.50/17,047.42 = 11,880.09/x
3. Step 3: Cross multiply
   12,357.50x = 17,047.42 × 11,880.09
4. Step 4: Simplify right side
   12,357.50x = 202,524,854.17
5. Step 5: Solve for x
   x = 202,524,854.17/12,357.50
6. Step 6: Final answer
   x = 16,388.83