Finding the Fourth Proportional to 3,988.72, 5,504.70 and 2,310.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,988.72 : 5,504.70 = 2,310.76 : x
2. Step 2: Convert to fraction form
   3,988.72/5,504.70 = 2,310.76/x
3. Step 3: Cross multiply
   3,988.72x = 5,504.70 × 2,310.76
4. Step 4: Simplify right side
   3,988.72x = 12,720,040.57
5. Step 5: Solve for x
   x = 12,720,040.57/3,988.72
6. Step 6: Final answer
   x = 3,189.00