Finding the Fourth Proportional to 12,439.76, 18,659.42 and 3,079.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,439.76 : 18,659.42 = 3,079.76 : x
2. Step 2: Convert to fraction form
   12,439.76/18,659.42 = 3,079.76/x
3. Step 3: Cross multiply
   12,439.76x = 18,659.42 × 3,079.76
4. Step 4: Simplify right side
   12,439.76x = 57,466,535.34
5. Step 5: Solve for x
   x = 57,466,535.34/12,439.76
6. Step 6: Final answer
   x = 4,619.59