Finding the Fourth Proportional to 21,078.69, 29,075.87 and 13,906.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,078.69 : 29,075.87 = 13,906.05 : x
2. Step 2: Convert to fraction form
   21,078.69/29,075.87 = 13,906.05/x
3. Step 3: Cross multiply
   21,078.69x = 29,075.87 × 13,906.05
4. Step 4: Simplify right side
   21,078.69x = 404,330,432.48
5. Step 5: Solve for x
   x = 404,330,432.48/21,078.69
6. Step 6: Final answer
   x = 19,181.95