Finding the Fourth Proportional to 9,978.84, 13,771.98 and 5,787.24

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.84 : 13,771.98 = 5,787.24 : x
2. Step 2: Convert to fraction form
   9,978.84/13,771.98 = 5,787.24/x
3. Step 3: Cross multiply
   9,978.84x = 13,771.98 × 5,787.24
4. Step 4: Simplify right side
   9,978.84x = 79,701,753.54
5. Step 5: Solve for x
   x = 79,701,753.54/9,978.84
6. Step 6: Final answer
   x = 7,987.08