Finding the Fourth Proportional to 3,748.40, 5,620.56 and 3,128.74

Step by Step Solution

1. Step 1: Write the proportion equation
   3,748.40 : 5,620.56 = 3,128.74 : x
2. Step 2: Convert to fraction form
   3,748.40/5,620.56 = 3,128.74/x
3. Step 3: Cross multiply
   3,748.40x = 5,620.56 × 3,128.74
4. Step 4: Simplify right side
   3,748.40x = 17,585,270.89
5. Step 5: Solve for x
   x = 17,585,270.89/3,748.40
6. Step 6: Final answer
   x = 4,691.41