Finding the Fourth Proportional to 21,106.77, 29,118.55 and 13,946.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,106.77 : 29,118.55 = 13,946.47 : x
2. Step 2: Convert to fraction form
   21,106.77/29,118.55 = 13,946.47/x
3. Step 3: Cross multiply
   21,106.77x = 29,118.55 × 13,946.47
4. Step 4: Simplify right side
   21,106.77x = 406,100,984.02
5. Step 5: Solve for x
   x = 406,100,984.02/21,106.77
6. Step 6: Final answer
   x = 19,240.32