Finding the Fourth Proportional to 9,771.50, 13,485.15 and 5,355.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,771.50 : 13,485.15 = 5,355.50 : x
2. Step 2: Convert to fraction form
   9,771.50/13,485.15 = 5,355.50/x
3. Step 3: Cross multiply
   9,771.50x = 13,485.15 × 5,355.50
4. Step 4: Simplify right side
   9,771.50x = 72,219,720.83
5. Step 5: Solve for x
   x = 72,219,720.83/9,771.50
6. Step 6: Final answer
   x = 7,390.85