Finding the Fourth Proportional to 21,099.56, 29,124.72 and 12,150.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,099.56 : 29,124.72 = 12,150.63 : x
2. Step 2: Convert to fraction form
   21,099.56/29,124.72 = 12,150.63/x
3. Step 3: Cross multiply
   21,099.56x = 29,124.72 × 12,150.63
4. Step 4: Simplify right side
   21,099.56x = 353,883,564.57
5. Step 5: Solve for x
   x = 353,883,564.57/21,099.56
6. Step 6: Final answer
   x = 16,772.08