Finding the Fourth Proportional to 21,086.47, 29,099.27 and 12,011.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.47 : 29,099.27 = 12,011.83 : x
2. Step 2: Convert to fraction form
   21,086.47/29,099.27 = 12,011.83/x
3. Step 3: Cross multiply
   21,086.47x = 29,099.27 × 12,011.83
4. Step 4: Simplify right side
   21,086.47x = 349,535,484.36
5. Step 5: Solve for x
   x = 349,535,484.36/21,086.47
6. Step 6: Final answer
   x = 16,576.29