Finding the Fourth Proportional to 9,628.55, 13,287.43 and 5,436.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,628.55 : 13,287.43 = 5,436.80 : x
2. Step 2: Convert to fraction form
   9,628.55/13,287.43 = 5,436.80/x
3. Step 3: Cross multiply
   9,628.55x = 13,287.43 × 5,436.80
4. Step 4: Simplify right side
   9,628.55x = 72,241,133.77
5. Step 5: Solve for x
   x = 72,241,133.77/9,628.55
6. Step 6: Final answer
   x = 7,502.80