Finding the Fourth Proportional to 10,988.28, 16,478.31 and 3,966.39

Step by Step Solution

1. Step 1: Write the proportion equation
   10,988.28 : 16,478.31 = 3,966.39 : x
2. Step 2: Convert to fraction form
   10,988.28/16,478.31 = 3,966.39/x
3. Step 3: Cross multiply
   10,988.28x = 16,478.31 × 3,966.39
4. Step 4: Simplify right side
   10,988.28x = 65,359,404.00
5. Step 5: Solve for x
   x = 65,359,404.00/10,988.28
6. Step 6: Final answer
   x = 5,948.10