Finding the Fourth Proportional to 3,642.70, 5,028.24 and 2,151.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,642.70 : 5,028.24 = 2,151.28 : x
2. Step 2: Convert to fraction form
   3,642.70/5,028.24 = 2,151.28/x
3. Step 3: Cross multiply
   3,642.70x = 5,028.24 × 2,151.28
4. Step 4: Simplify right side
   3,642.70x = 10,817,152.15
5. Step 5: Solve for x
   x = 10,817,152.15/3,642.70
6. Step 6: Final answer
   x = 2,969.54