Finding the Fourth Proportional to 9,975.21, 13,765.98 and 5,499.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,975.21 : 13,765.98 = 5,499.28 : x
2. Step 2: Convert to fraction form
   9,975.21/13,765.98 = 5,499.28/x
3. Step 3: Cross multiply
   9,975.21x = 13,765.98 × 5,499.28
4. Step 4: Simplify right side
   9,975.21x = 75,702,978.49
5. Step 5: Solve for x
   x = 75,702,978.49/9,975.21
6. Step 6: Final answer
   x = 7,589.11