Finding the Fourth Proportional to 21,677.36, 29,918.56 and 12,605.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,677.36 : 29,918.56 = 12,605.52 : x
2. Step 2: Convert to fraction form
   21,677.36/29,918.56 = 12,605.52/x
3. Step 3: Cross multiply
   21,677.36x = 29,918.56 × 12,605.52
4. Step 4: Simplify right side
   21,677.36x = 377,139,075.31
5. Step 5: Solve for x
   x = 377,139,075.31/21,677.36
6. Step 6: Final answer
   x = 17,397.84