Finding the Fourth Proportional to 10,428.05, 14,390.14 and 5,711.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.05 : 14,390.14 = 5,711.42 : x
2. Step 2: Convert to fraction form
   10,428.05/14,390.14 = 5,711.42/x
3. Step 3: Cross multiply
   10,428.05x = 14,390.14 × 5,711.42
4. Step 4: Simplify right side
   10,428.05x = 82,188,133.40
5. Step 5: Solve for x
   x = 82,188,133.40/10,428.05
6. Step 6: Final answer
   x = 7,881.45