Finding the Fourth Proportional to 17,155.40, 23,674.82 and 12,128.47

Step by Step Solution

1. Step 1: Write the proportion equation
   17,155.40 : 23,674.82 = 12,128.47 : x
2. Step 2: Convert to fraction form
   17,155.40/23,674.82 = 12,128.47/x
3. Step 3: Cross multiply
   17,155.40x = 23,674.82 × 12,128.47
4. Step 4: Simplify right side
   17,155.40x = 287,139,224.30
5. Step 5: Solve for x
   x = 287,139,224.30/17,155.40
6. Step 6: Final answer
   x = 16,737.55