Finding the Fourth Proportional to 11,025.74, 16,539.47 and 3,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,025.74 : 16,539.47 = 3,128.12 : x
2. Step 2: Convert to fraction form
   11,025.74/16,539.47 = 3,128.12/x
3. Step 3: Cross multiply
   11,025.74x = 16,539.47 × 3,128.12
4. Step 4: Simplify right side
   11,025.74x = 51,737,446.90
5. Step 5: Solve for x
   x = 51,737,446.90/11,025.74
6. Step 6: Final answer
   x = 4,692.42