Finding the Fourth Proportional to 9,989.20, 14,975.15 and 3,828.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.20 : 14,975.15 = 3,828.88 : x
2. Step 2: Convert to fraction form
   9,989.20/14,975.15 = 3,828.88/x
3. Step 3: Cross multiply
   9,989.20x = 14,975.15 × 3,828.88
4. Step 4: Simplify right side
   9,989.20x = 57,337,977.46
5. Step 5: Solve for x
   x = 57,337,977.46/9,989.20
6. Step 6: Final answer
   x = 5,740.00