Finding the Fourth Proportional to 5,365.16, 7,404.78 and 3,128.34

Step by Step Solution

1. Step 1: Write the proportion equation
   5,365.16 : 7,404.78 = 3,128.34 : x
2. Step 2: Convert to fraction form
   5,365.16/7,404.78 = 3,128.34/x
3. Step 3: Cross multiply
   5,365.16x = 7,404.78 × 3,128.34
4. Step 4: Simplify right side
   5,365.16x = 23,164,669.47
5. Step 5: Solve for x
   x = 23,164,669.47/5,365.16
6. Step 6: Final answer
   x = 4,317.61