Finding the Fourth Proportional to 21,531.27, 29,715.88 and 12,099.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,531.27 : 29,715.88 = 12,099.82 : x
2. Step 2: Convert to fraction form
   21,531.27/29,715.88 = 12,099.82/x
3. Step 3: Cross multiply
   21,531.27x = 29,715.88 × 12,099.82
4. Step 4: Simplify right side
   21,531.27x = 359,556,799.14
5. Step 5: Solve for x
   x = 359,556,799.14/21,531.27
6. Step 6: Final answer
   x = 16,699.29