Finding the Fourth Proportional to 21,588.90, 29,788.72 and 12,028.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,588.90 : 29,788.72 = 12,028.54 : x
2. Step 2: Convert to fraction form
   21,588.90/29,788.72 = 12,028.54/x
3. Step 3: Cross multiply
   21,588.90x = 29,788.72 × 12,028.54
4. Step 4: Simplify right side
   21,588.90x = 358,314,810.07
5. Step 5: Solve for x
   x = 358,314,810.07/21,588.90
6. Step 6: Final answer
   x = 16,597.18