Finding the Fourth Proportional to 9,988.22, 13,783.79 and 5,511.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,988.22 : 13,783.79 = 5,511.98 : x
2. Step 2: Convert to fraction form
   9,988.22/13,783.79 = 5,511.98/x
3. Step 3: Cross multiply
   9,988.22x = 13,783.79 × 5,511.98
4. Step 4: Simplify right side
   9,988.22x = 75,975,974.80
5. Step 5: Solve for x
   x = 75,975,974.80/9,988.22
6. Step 6: Final answer
   x = 7,606.56