Finding the Fourth Proportional to 9,987.30, 13,782.82 and 5,511.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,987.30 : 13,782.82 = 5,511.20 : x
2. Step 2: Convert to fraction form
   9,987.30/13,782.82 = 5,511.20/x
3. Step 3: Cross multiply
   9,987.30x = 13,782.82 × 5,511.20
4. Step 4: Simplify right side
   9,987.30x = 75,959,877.58
5. Step 5: Solve for x
   x = 75,959,877.58/9,987.30
6. Step 6: Final answer
   x = 7,605.65