Finding the Fourth Proportional to 2,176.80, 3,003.24 and 1,391.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,176.80 : 3,003.24 = 1,391.30 : x
2. Step 2: Convert to fraction form
   2,176.80/3,003.24 = 1,391.30/x
3. Step 3: Cross multiply
   2,176.80x = 3,003.24 × 1,391.30
4. Step 4: Simplify right side
   2,176.80x = 4,178,407.81
5. Step 5: Solve for x
   x = 4,178,407.81/2,176.80
6. Step 6: Final answer
   x = 1,919.52