Finding the Fourth Proportional to 12,390.47, 17,075.27 and 12,162.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.47 : 17,075.27 = 12,162.76 : x
2. Step 2: Convert to fraction form
   12,390.47/17,075.27 = 12,162.76/x
3. Step 3: Cross multiply
   12,390.47x = 17,075.27 × 12,162.76
4. Step 4: Simplify right side
   12,390.47x = 207,682,389.45
5. Step 5: Solve for x
   x = 207,682,389.45/12,390.47
6. Step 6: Final answer
   x = 16,761.47