Finding the Fourth Proportional to 2,176.62, 3,002.24 and 1,390.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,176.62 : 3,002.24 = 1,390.30 : x
2. Step 2: Convert to fraction form
   2,176.62/3,002.24 = 1,390.30/x
3. Step 3: Cross multiply
   2,176.62x = 3,002.24 × 1,390.30
4. Step 4: Simplify right side
   2,176.62x = 4,174,014.27
5. Step 5: Solve for x
   x = 4,174,014.27/2,176.62
6. Step 6: Final answer
   x = 1,917.66