Finding the Fourth Proportional to 9,003.54, 12,421.41 and 5,640.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,003.54 : 12,421.41 = 5,640.49 : x
2. Step 2: Convert to fraction form
   9,003.54/12,421.41 = 5,640.49/x
3. Step 3: Cross multiply
   9,003.54x = 12,421.41 × 5,640.49
4. Step 4: Simplify right side
   9,003.54x = 70,062,838.89
5. Step 5: Solve for x
   x = 70,062,838.89/9,003.54
6. Step 6: Final answer
   x = 7,781.70