Finding the Fourth Proportional to 3,985.84, 5,499.72 and 2,307.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.84 : 5,499.72 = 2,307.31 : x
2. Step 2: Convert to fraction form
   3,985.84/5,499.72 = 2,307.31/x
3. Step 3: Cross multiply
   3,985.84x = 5,499.72 × 2,307.31
4. Step 4: Simplify right side
   3,985.84x = 12,689,558.95
5. Step 5: Solve for x
   x = 12,689,558.95/3,985.84
6. Step 6: Final answer
   x = 3,183.66