Finding the Fourth Proportional to 9,987.87, 13,780.20 and 5,795.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,987.87 : 13,780.20 = 5,795.31 : x
2. Step 2: Convert to fraction form
   9,987.87/13,780.20 = 5,795.31/x
3. Step 3: Cross multiply
   9,987.87x = 13,780.20 × 5,795.31
4. Step 4: Simplify right side
   9,987.87x = 79,860,530.86
5. Step 5: Solve for x
   x = 79,860,530.86/9,987.87
6. Step 6: Final answer
   x = 7,995.75