Finding the Fourth Proportional to 9,987.65, 13,783.59 and 5,511.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,987.65 : 13,783.59 = 5,511.38 : x
2. Step 2: Convert to fraction form
   9,987.65/13,783.59 = 5,511.38/x
3. Step 3: Cross multiply
   9,987.65x = 13,783.59 × 5,511.38
4. Step 4: Simplify right side
   9,987.65x = 75,966,574.70
5. Step 5: Solve for x
   x = 75,966,574.70/9,987.65
6. Step 6: Final answer
   x = 7,606.05