Finding the Fourth Proportional to 21,989.52, 30,342.24 and 12,556.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,989.52 : 30,342.24 = 12,556.08 : x
2. Step 2: Convert to fraction form
   21,989.52/30,342.24 = 12,556.08/x
3. Step 3: Cross multiply
   21,989.52x = 30,342.24 × 12,556.08
4. Step 4: Simplify right side
   21,989.52x = 380,979,592.82
5. Step 5: Solve for x
   x = 380,979,592.82/21,989.52
6. Step 6: Final answer
   x = 17,325.51