Finding the Fourth Proportional to 3,980.54, 5,972.43 and 1,790.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.54 : 5,972.43 = 1,790.30 : x
2. Step 2: Convert to fraction form
   3,980.54/5,972.43 = 1,790.30/x
3. Step 3: Cross multiply
   3,980.54x = 5,972.43 × 1,790.30
4. Step 4: Simplify right side
   3,980.54x = 10,692,463.07
5. Step 5: Solve for x
   x = 10,692,463.07/3,980.54
6. Step 6: Final answer
   x = 2,686.18