Finding the Fourth Proportional to 9,621.48, 13,273.74 and 5,428.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,621.48 : 13,273.74 = 5,428.92 : x
2. Step 2: Convert to fraction form
   9,621.48/13,273.74 = 5,428.92/x
3. Step 3: Cross multiply
   9,621.48x = 13,273.74 × 5,428.92
4. Step 4: Simplify right side
   9,621.48x = 72,062,072.56
5. Step 5: Solve for x
   x = 72,062,072.56/9,621.48
6. Step 6: Final answer
   x = 7,489.71