Finding the Fourth Proportional to 21,453.60, 29,613.42 and 12,504.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,453.60 : 29,613.42 = 12,504.72 : x
2. Step 2: Convert to fraction form
   21,453.60/29,613.42 = 12,504.72/x
3. Step 3: Cross multiply
   21,453.60x = 29,613.42 × 12,504.72
4. Step 4: Simplify right side
   21,453.60x = 370,307,525.34
5. Step 5: Solve for x
   x = 370,307,525.34/21,453.60
6. Step 6: Final answer
   x = 17,260.86