Finding the Fourth Proportional to 9,989.70, 13,785.42 and 5,513.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.70 : 13,785.42 = 5,513.50 : x
2. Step 2: Convert to fraction form
   9,989.70/13,785.42 = 5,513.50/x
3. Step 3: Cross multiply
   9,989.70x = 13,785.42 × 5,513.50
4. Step 4: Simplify right side
   9,989.70x = 76,005,913.17
5. Step 5: Solve for x
   x = 76,005,913.17/9,989.70
6. Step 6: Final answer
   x = 7,608.43