Finding the Fourth Proportional to 21,651.86, 29,882.16 and 13,155.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,651.86 : 29,882.16 = 13,155.36 : x
2. Step 2: Convert to fraction form
   21,651.86/29,882.16 = 13,155.36/x
3. Step 3: Cross multiply
   21,651.86x = 29,882.16 × 13,155.36
4. Step 4: Simplify right side
   21,651.86x = 393,110,749.45
5. Step 5: Solve for x
   x = 393,110,749.45/21,651.86
6. Step 6: Final answer
   x = 18,155.98