Finding the Fourth Proportional to 9,989.56, 13,784.97 and 5,513.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.56 : 13,784.97 = 5,513.31 : x
2. Step 2: Convert to fraction form
   9,989.56/13,784.97 = 5,513.31/x
3. Step 3: Cross multiply
   9,989.56x = 13,784.97 × 5,513.31
4. Step 4: Simplify right side
   9,989.56x = 76,000,812.95
5. Step 5: Solve for x
   x = 76,000,812.95/9,989.56
6. Step 6: Final answer
   x = 7,608.02