Finding the Fourth Proportional to 21,100.33, 29,131.09 and 13,153.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.33 : 29,131.09 = 13,153.32 : x
2. Step 2: Convert to fraction form
   21,100.33/29,131.09 = 13,153.32/x
3. Step 3: Cross multiply
   21,100.33x = 29,131.09 × 13,153.32
4. Step 4: Simplify right side
   21,100.33x = 383,170,515.84
5. Step 5: Solve for x
   x = 383,170,515.84/21,100.33
6. Step 6: Final answer
   x = 18,159.46