Finding the Fourth Proportional to 10,854.56, 16,281.83 and 7,129.87

Step by Step Solution

1. Step 1: Write the proportion equation
   10,854.56 : 16,281.83 = 7,129.87 : x
2. Step 2: Convert to fraction form
   10,854.56/16,281.83 = 7,129.87/x
3. Step 3: Cross multiply
   10,854.56x = 16,281.83 × 7,129.87
4. Step 4: Simplify right side
   10,854.56x = 116,087,308.38
5. Step 5: Solve for x
   x = 116,087,308.38/10,854.56
6. Step 6: Final answer
   x = 10,694.79