Finding the Fourth Proportional to 2,487.69, 3,728.17 and 947.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.69 : 3,728.17 = 947.85 : x
2. Step 2: Convert to fraction form
   2,487.69/3,728.17 = 947.85/x
3. Step 3: Cross multiply
   2,487.69x = 3,728.17 × 947.85
4. Step 4: Simplify right side
   2,487.69x = 3,533,745.93
5. Step 5: Solve for x
   x = 3,533,745.93/2,487.69
6. Step 6: Final answer
   x = 1,420.49