Finding the Fourth Proportional to 3,776.80, 5,663.76 and 1,311.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,776.80 : 5,663.76 = 1,311.52 : x
2. Step 2: Convert to fraction form
   3,776.80/5,663.76 = 1,311.52/x
3. Step 3: Cross multiply
   3,776.80x = 5,663.76 × 1,311.52
4. Step 4: Simplify right side
   3,776.80x = 7,428,134.52
5. Step 5: Solve for x
   x = 7,428,134.52/3,776.80
6. Step 6: Final answer
   x = 1,966.78