Finding the Fourth Proportional to 8,989.54, 13,490.38 and 3,146.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,989.54 : 13,490.38 = 3,146.20 : x
2. Step 2: Convert to fraction form
   8,989.54/13,490.38 = 3,146.20/x
3. Step 3: Cross multiply
   8,989.54x = 13,490.38 × 3,146.20
4. Step 4: Simplify right side
   8,989.54x = 42,443,433.56
5. Step 5: Solve for x
   x = 42,443,433.56/8,989.54
6. Step 6: Final answer
   x = 4,721.42