Finding the Fourth Proportional to 3,510.72, 5,269.87 and 3,123.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,510.72 : 5,269.87 = 3,123.20 : x
2. Step 2: Convert to fraction form
   3,510.72/5,269.87 = 3,123.20/x
3. Step 3: Cross multiply
   3,510.72x = 5,269.87 × 3,123.20
4. Step 4: Simplify right side
   3,510.72x = 16,458,875.06
5. Step 5: Solve for x
   x = 16,458,875.06/3,510.72
6. Step 6: Final answer
   x = 4,688.18