Finding the Fourth Proportional to 7,478.55, 10,320.25 and 4,121.28

Step by Step Solution

1. Step 1: Write the proportion equation
   7,478.55 : 10,320.25 = 4,121.28 : x
2. Step 2: Convert to fraction form
   7,478.55/10,320.25 = 4,121.28/x
3. Step 3: Cross multiply
   7,478.55x = 10,320.25 × 4,121.28
4. Step 4: Simplify right side
   7,478.55x = 42,532,631.55
5. Step 5: Solve for x
   x = 42,532,631.55/7,478.55
6. Step 6: Final answer
   x = 5,687.28