Finding the Fourth Proportional to 12,956.76, 19,431.90 and 3,722.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,956.76 : 19,431.90 = 3,722.76 : x
2. Step 2: Convert to fraction form
   12,956.76/19,431.90 = 3,722.76/x
3. Step 3: Cross multiply
   12,956.76x = 19,431.90 × 3,722.76
4. Step 4: Simplify right side
   12,956.76x = 72,340,300.04
5. Step 5: Solve for x
   x = 72,340,300.04/12,956.76
6. Step 6: Final answer
   x = 5,583.21