Finding the Fourth Proportional to 12,870.82, 19,306.58 and 4,105.74

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.82 : 19,306.58 = 4,105.74 : x
2. Step 2: Convert to fraction form
   12,870.82/19,306.58 = 4,105.74/x
3. Step 3: Cross multiply
   12,870.82x = 19,306.58 × 4,105.74
4. Step 4: Simplify right side
   12,870.82x = 79,267,752.59
5. Step 5: Solve for x
   x = 79,267,752.59/12,870.82
6. Step 6: Final answer
   x = 6,158.72