Finding the Fourth Proportional to 3,987.72, 5,503.32 and 2,309.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.72 : 5,503.32 = 2,309.76 : x
2. Step 2: Convert to fraction form
   3,987.72/5,503.32 = 2,309.76/x
3. Step 3: Cross multiply
   3,987.72x = 5,503.32 × 2,309.76
4. Step 4: Simplify right side
   3,987.72x = 12,711,348.40
5. Step 5: Solve for x
   x = 12,711,348.40/3,987.72
6. Step 6: Final answer
   x = 3,187.62