Finding the Fourth Proportional to 10,428.25, 14,390.84 and 5,712.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.25 : 14,390.84 = 5,712.56 : x
2. Step 2: Convert to fraction form
   10,428.25/14,390.84 = 5,712.56/x
3. Step 3: Cross multiply
   10,428.25x = 14,390.84 × 5,712.56
4. Step 4: Simplify right side
   10,428.25x = 82,208,508.39
5. Step 5: Solve for x
   x = 82,208,508.39/10,428.25
6. Step 6: Final answer
   x = 7,883.25