Finding the Fourth Proportional to 11,815.68, 17,725.68 and 4,890.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,815.68 : 17,725.68 = 4,890.72 : x
2. Step 2: Convert to fraction form
   11,815.68/17,725.68 = 4,890.72/x
3. Step 3: Cross multiply
   11,815.68x = 17,725.68 × 4,890.72
4. Step 4: Simplify right side
   11,815.68x = 86,691,337.69
5. Step 5: Solve for x
   x = 86,691,337.69/11,815.68
6. Step 6: Final answer
   x = 7,336.97