Finding the Fourth Proportional to 13,210.72, 19,818.96 and 3,976

Step by Step Solution

1. Step 1: Write the proportion equation
   13,210.72 : 19,818.96 = 3,976 : x
2. Step 2: Convert to fraction form
   13,210.72/19,818.96 = 3,976/x
3. Step 3: Cross multiply
   13,210.72x = 19,818.96 × 3,976
4. Step 4: Simplify right side
   13,210.72x = 78,800,184.96
5. Step 5: Solve for x
   x = 78,800,184.96/13,210.72
6. Step 6: Final answer
   x = 5,964.87