Finding the Fourth Proportional to 9,988.35, 13,783.91 and 5,512.11

Step by Step Solution

1. Step 1: Write the proportion equation
   9,988.35 : 13,783.91 = 5,512.11 : x
2. Step 2: Convert to fraction form
   9,988.35/13,783.91 = 5,512.11/x
3. Step 3: Cross multiply
   9,988.35x = 13,783.91 × 5,512.11
4. Step 4: Simplify right side
   9,988.35x = 75,978,428.15
5. Step 5: Solve for x
   x = 75,978,428.15/9,988.35
6. Step 6: Final answer
   x = 7,606.70