Finding the Fourth Proportional to 2,082.72, 3,123.96 and 543.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.72 : 3,123.96 = 543.72 : x
2. Step 2: Convert to fraction form
   2,082.72/3,123.96 = 543.72/x
3. Step 3: Cross multiply
   2,082.72x = 3,123.96 × 543.72
4. Step 4: Simplify right side
   2,082.72x = 1,698,559.53
5. Step 5: Solve for x
   x = 1,698,559.53/2,082.72
6. Step 6: Final answer
   x = 815.55