Finding the Fourth Proportional to 9,988.56, 13,783.59 and 5,512.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,988.56 : 13,783.59 = 5,512.31 : x
2. Step 2: Convert to fraction form
   9,988.56/13,783.59 = 5,512.31/x
3. Step 3: Cross multiply
   9,988.56x = 13,783.59 × 5,512.31
4. Step 4: Simplify right side
   9,988.56x = 75,979,352.07
5. Step 5: Solve for x
   x = 75,979,352.07/9,988.56
6. Step 6: Final answer
   x = 7,606.64