Finding the Fourth Proportional to 9,988.12, 13,783.59 and 5,511.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,988.12 : 13,783.59 = 5,511.87 : x
2. Step 2: Convert to fraction form
   9,988.12/13,783.59 = 5,511.87/x
3. Step 3: Cross multiply
   9,988.12x = 13,783.59 × 5,511.87
4. Step 4: Simplify right side
   9,988.12x = 75,973,356.21
5. Step 5: Solve for x
   x = 75,973,356.21/9,988.12
6. Step 6: Final answer
   x = 7,606.37