Finding the Fourth Proportional to 21,109.98, 29,134.92 and 13,154.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109.98 : 29,134.92 = 13,154.76 : x
2. Step 2: Convert to fraction form
   21,109.98/29,134.92 = 13,154.76/x
3. Step 3: Cross multiply
   21,109.98x = 29,134.92 × 13,154.76
4. Step 4: Simplify right side
   21,109.98x = 383,262,880.22
5. Step 5: Solve for x
   x = 383,262,880.22/21,109.98
6. Step 6: Final answer
   x = 18,155.53