Finding the Fourth Proportional to 21,041.12, 29,047.27 and 13,085.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,041.12 : 29,047.27 = 13,085.91 : x
2. Step 2: Convert to fraction form
   21,041.12/29,047.27 = 13,085.91/x
3. Step 3: Cross multiply
   21,041.12x = 29,047.27 × 13,085.91
4. Step 4: Simplify right side
   21,041.12x = 380,109,960.97
5. Step 5: Solve for x
   x = 380,109,960.97/21,041.12
6. Step 6: Final answer
   x = 18,065.10