Finding the Fourth Proportional to 5,172.04, 7,139.46 and 3,974.68

Step by Step Solution

1. Step 1: Write the proportion equation
   5,172.04 : 7,139.46 = 3,974.68 : x
2. Step 2: Convert to fraction form
   5,172.04/7,139.46 = 3,974.68/x
3. Step 3: Cross multiply
   5,172.04x = 7,139.46 × 3,974.68
4. Step 4: Simplify right side
   5,172.04x = 28,377,068.87
5. Step 5: Solve for x
   x = 28,377,068.87/5,172.04
6. Step 6: Final answer
   x = 5,486.63