Finding the Fourth Proportional to 3,902.18, 5,383.50 and 2,407.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,902.18 : 5,383.50 = 2,407.50 : x
2. Step 2: Convert to fraction form
   3,902.18/5,383.50 = 2,407.50/x
3. Step 3: Cross multiply
   3,902.18x = 5,383.50 × 2,407.50
4. Step 4: Simplify right side
   3,902.18x = 12,960,776.25
5. Step 5: Solve for x
   x = 12,960,776.25/3,902.18
6. Step 6: Final answer
   x = 3,321.42