Finding the Fourth Proportional to 11,856.09, 16,359.15 and 7,140.69

Step by Step Solution

1. Step 1: Write the proportion equation
   11,856.09 : 16,359.15 = 7,140.69 : x
2. Step 2: Convert to fraction form
   11,856.09/16,359.15 = 7,140.69/x
3. Step 3: Cross multiply
   11,856.09x = 16,359.15 × 7,140.69
4. Step 4: Simplify right side
   11,856.09x = 116,815,618.81
5. Step 5: Solve for x
   x = 116,815,618.81/11,856.09
6. Step 6: Final answer
   x = 9,852.79