Finding the Fourth Proportional to 21,075, 29,083.50 and 12,693.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,075 : 29,083.50 = 12,693.12 : x
2. Step 2: Convert to fraction form
   21,075/29,083.50 = 12,693.12/x
3. Step 3: Cross multiply
   21,075x = 29,083.50 × 12,693.12
4. Step 4: Simplify right side
   21,075x = 369,160,355.52
5. Step 5: Solve for x
   x = 369,160,355.52/21,075
6. Step 6: Final answer
   x = 17,516.51