Finding the Fourth Proportional to 11,987.55, 17,980.72 and 3,222.54

Step by Step Solution

1. Step 1: Write the proportion equation
   11,987.55 : 17,980.72 = 3,222.54 : x
2. Step 2: Convert to fraction form
   11,987.55/17,980.72 = 3,222.54/x
3. Step 3: Cross multiply
   11,987.55x = 17,980.72 × 3,222.54
4. Step 4: Simplify right side
   11,987.55x = 57,943,581.37
5. Step 5: Solve for x
   x = 57,943,581.37/11,987.55
6. Step 6: Final answer
   x = 4,833.65