Finding the Fourth Proportional to 21,436.76, 29,584.53 and 12,487.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,436.76 : 29,584.53 = 12,487.07 : x
2. Step 2: Convert to fraction form
   21,436.76/29,584.53 = 12,487.07/x
3. Step 3: Cross multiply
   21,436.76x = 29,584.53 × 12,487.07
4. Step 4: Simplify right side
   21,436.76x = 369,424,097.03
5. Step 5: Solve for x
   x = 369,424,097.03/21,436.76
6. Step 6: Final answer
   x = 17,233.21