Finding the Fourth Proportional to 11,105.43, 16,639.71 and 7,811.61

Step by Step Solution

1. Step 1: Write the proportion equation
   11,105.43 : 16,639.71 = 7,811.61 : x
2. Step 2: Convert to fraction form
   11,105.43/16,639.71 = 7,811.61/x
3. Step 3: Cross multiply
   11,105.43x = 16,639.71 × 7,811.61
4. Step 4: Simplify right side
   11,105.43x = 129,982,925.03
5. Step 5: Solve for x
   x = 129,982,925.03/11,105.43
6. Step 6: Final answer
   x = 11,704.45