Finding the Fourth Proportional to 21,085.27, 29,097.70 and 12,132.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,085.27 : 29,097.70 = 12,132.59 : x
2. Step 2: Convert to fraction form
   21,085.27/29,097.70 = 12,132.59/x
3. Step 3: Cross multiply
   21,085.27x = 29,097.70 × 12,132.59
4. Step 4: Simplify right side
   21,085.27x = 353,030,506.46
5. Step 5: Solve for x
   x = 353,030,506.46/21,085.27
6. Step 6: Final answer
   x = 16,742.99