Finding the Fourth Proportional to 9,921.98, 13,692.50 and 5,446.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,921.98 : 13,692.50 = 5,446.15 : x
2. Step 2: Convert to fraction form
   9,921.98/13,692.50 = 5,446.15/x
3. Step 3: Cross multiply
   9,921.98x = 13,692.50 × 5,446.15
4. Step 4: Simplify right side
   9,921.98x = 74,571,408.88
5. Step 5: Solve for x
   x = 74,571,408.88/9,921.98
6. Step 6: Final answer
   x = 7,515.78