Finding the Fourth Proportional to 11,218.78, 15,469.27 and 7,180.32

Step by Step Solution

1. Step 1: Write the proportion equation
   11,218.78 : 15,469.27 = 7,180.32 : x
2. Step 2: Convert to fraction form
   11,218.78/15,469.27 = 7,180.32/x
3. Step 3: Cross multiply
   11,218.78x = 15,469.27 × 7,180.32
4. Step 4: Simplify right side
   11,218.78x = 111,074,308.77
5. Step 5: Solve for x
   x = 111,074,308.77/11,218.78
6. Step 6: Final answer
   x = 9,900.75