Finding the Fourth Proportional to 3,902.98, 5,385.69 and 2,309.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,902.98 : 5,385.69 = 2,309.69 : x
2. Step 2: Convert to fraction form
   3,902.98/5,385.69 = 2,309.69/x
3. Step 3: Cross multiply
   3,902.98x = 5,385.69 × 2,309.69
4. Step 4: Simplify right side
   3,902.98x = 12,439,274.34
5. Step 5: Solve for x
   x = 12,439,274.34/3,902.98
6. Step 6: Final answer
   x = 3,187.12