Finding the Fourth Proportional to 21,677.16, 29,799.56 and 18,641.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,677.16 : 29,799.56 = 18,641.15 : x
2. Step 2: Convert to fraction form
   21,677.16/29,799.56 = 18,641.15/x
3. Step 3: Cross multiply
   21,677.16x = 29,799.56 × 18,641.15
4. Step 4: Simplify right side
   21,677.16x = 555,498,067.89
5. Step 5: Solve for x
   x = 555,498,067.89/21,677.16
6. Step 6: Final answer
   x = 25,625.96