Finding the Fourth Proportional to 10,938.28, 16,405.02 and 3,145

Step by Step Solution

1. Step 1: Write the proportion equation
   10,938.28 : 16,405.02 = 3,145 : x
2. Step 2: Convert to fraction form
   10,938.28/16,405.02 = 3,145/x
3. Step 3: Cross multiply
   10,938.28x = 16,405.02 × 3,145
4. Step 4: Simplify right side
   10,938.28x = 51,593,787.90
5. Step 5: Solve for x
   x = 51,593,787.90/10,938.28
6. Step 6: Final answer
   x = 4,716.81