Finding the Fourth Proportional to 10,428.14, 14,390.76 and 5,712.32

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.14 : 14,390.76 = 5,712.32 : x
2. Step 2: Convert to fraction form
   10,428.14/14,390.76 = 5,712.32/x
3. Step 3: Cross multiply
   10,428.14x = 14,390.76 × 5,712.32
4. Step 4: Simplify right side
   10,428.14x = 82,204,683.56
5. Step 5: Solve for x
   x = 82,204,683.56/10,428.14
6. Step 6: Final answer
   x = 7,882.97