Finding the Fourth Proportional to 12,989.17, 19,483.71 and 3,128.41

Step by Step Solution

1. Step 1: Write the proportion equation
   12,989.17 : 19,483.71 = 3,128.41 : x
2. Step 2: Convert to fraction form
   12,989.17/19,483.71 = 3,128.41/x
3. Step 3: Cross multiply
   12,989.17x = 19,483.71 × 3,128.41
4. Step 4: Simplify right side
   12,989.17x = 60,953,033.20
5. Step 5: Solve for x
   x = 60,953,033.20/12,989.17
6. Step 6: Final answer
   x = 4,692.60