Finding the Fourth Proportional to 21,081.84, 29,099 and 13,916.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,081.84 : 29,099 = 13,916.98 : x
2. Step 2: Convert to fraction form
   21,081.84/29,099 = 13,916.98/x
3. Step 3: Cross multiply
   21,081.84x = 29,099 × 13,916.98
4. Step 4: Simplify right side
   21,081.84x = 404,970,201.02
5. Step 5: Solve for x
   x = 404,970,201.02/21,081.84
6. Step 6: Final answer
   x = 19,209.43