Finding the Fourth Proportional to 3,980.55, 5,967.71 and 1,787.74

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.55 : 5,967.71 = 1,787.74 : x
2. Step 2: Convert to fraction form
   3,980.55/5,967.71 = 1,787.74/x
3. Step 3: Cross multiply
   3,980.55x = 5,967.71 × 1,787.74
4. Step 4: Simplify right side
   3,980.55x = 10,668,713.88
5. Step 5: Solve for x
   x = 10,668,713.88/3,980.55
6. Step 6: Final answer
   x = 2,680.21