Finding the Fourth Proportional to 13,120.56, 19,680.57 and 3,259.81

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.56 : 19,680.57 = 3,259.81 : x
2. Step 2: Convert to fraction form
   13,120.56/19,680.57 = 3,259.81/x
3. Step 3: Cross multiply
   13,120.56x = 19,680.57 × 3,259.81
4. Step 4: Simplify right side
   13,120.56x = 64,154,918.89
5. Step 5: Solve for x
   x = 64,154,918.89/13,120.56
6. Step 6: Final answer
   x = 4,889.65