Finding the Fourth Proportional to 9,989.01, 13,785.30 and 5,513.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.01 : 13,785.30 = 5,513.40 : x
2. Step 2: Convert to fraction form
   9,989.01/13,785.30 = 5,513.40/x
3. Step 3: Cross multiply
   9,989.01x = 13,785.30 × 5,513.40
4. Step 4: Simplify right side
   9,989.01x = 76,003,873.02
5. Step 5: Solve for x
   x = 76,003,873.02/9,989.01
6. Step 6: Final answer
   x = 7,608.75