Finding the Fourth Proportional to 7,580.63, 10,456.54 and 5,423.20

Step by Step Solution

1. Step 1: Write the proportion equation
   7,580.63 : 10,456.54 = 5,423.20 : x
2. Step 2: Convert to fraction form
   7,580.63/10,456.54 = 5,423.20/x
3. Step 3: Cross multiply
   7,580.63x = 10,456.54 × 5,423.20
4. Step 4: Simplify right side
   7,580.63x = 56,707,868.03
5. Step 5: Solve for x
   x = 56,707,868.03/7,580.63
6. Step 6: Final answer
   x = 7,480.62