Finding the Fourth Proportional to 12,579.84, 18,870.72 and 3,815.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,579.84 : 18,870.72 = 3,815.48 : x
2. Step 2: Convert to fraction form
   12,579.84/18,870.72 = 3,815.48/x
3. Step 3: Cross multiply
   12,579.84x = 18,870.72 × 3,815.48
4. Step 4: Simplify right side
   12,579.84x = 72,000,854.75
5. Step 5: Solve for x
   x = 72,000,854.75/12,579.84
6. Step 6: Final answer
   x = 5,723.51