Finding the Fourth Proportional to 21,727.83, 29,987.61 and 13,770.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,727.83 : 29,987.61 = 13,770.78 : x
2. Step 2: Convert to fraction form
   21,727.83/29,987.61 = 13,770.78/x
3. Step 3: Cross multiply
   21,727.83x = 29,987.61 × 13,770.78
4. Step 4: Simplify right side
   21,727.83x = 412,952,780.04
5. Step 5: Solve for x
   x = 412,952,780.04/21,727.83
6. Step 6: Final answer
   x = 19,005.71