Finding the Fourth Proportional to 9,990.41, 13,785.79 and 5,513.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.41 : 13,785.79 = 5,513.88 : x
2. Step 2: Convert to fraction form
   9,990.41/13,785.79 = 5,513.88/x
3. Step 3: Cross multiply
   9,990.41x = 13,785.79 × 5,513.88
4. Step 4: Simplify right side
   9,990.41x = 76,013,126.28
5. Step 5: Solve for x
   x = 76,013,126.28/9,990.41
6. Step 6: Final answer
   x = 7,608.61