Finding the Fourth Proportional to 21,061.80, 29,048.76 and 13,101.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.80 : 29,048.76 = 13,101.12 : x
2. Step 2: Convert to fraction form
   21,061.80/29,048.76 = 13,101.12/x
3. Step 3: Cross multiply
   21,061.80x = 29,048.76 × 13,101.12
4. Step 4: Simplify right side
   21,061.80x = 380,571,290.61
5. Step 5: Solve for x
   x = 380,571,290.61/21,061.80
6. Step 6: Final answer
   x = 18,069.27