Finding the Fourth Proportional to 2,178.72, 3,267.78 and 1,082.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.72 : 3,267.78 = 1,082.88 : x
2. Step 2: Convert to fraction form
   2,178.72/3,267.78 = 1,082.88/x
3. Step 3: Cross multiply
   2,178.72x = 3,267.78 × 1,082.88
4. Step 4: Simplify right side
   2,178.72x = 3,538,613.61
5. Step 5: Solve for x
   x = 3,538,613.61/2,178.72
6. Step 6: Final answer
   x = 1,624.17