Finding the Fourth Proportional to 9,989.61, 13,785.50 and 5,513.36

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.61 : 13,785.50 = 5,513.36 : x
2. Step 2: Convert to fraction form
   9,989.61/13,785.50 = 5,513.36/x
3. Step 3: Cross multiply
   9,989.61x = 13,785.50 × 5,513.36
4. Step 4: Simplify right side
   9,989.61x = 76,004,327.79
5. Step 5: Solve for x
   x = 76,004,327.79/9,989.61
6. Step 6: Final answer
   x = 7,608.34