Finding the Fourth Proportional to 12,619.83, 18,929.80 and 3,854.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,619.83 : 18,929.80 = 3,854.72 : x
2. Step 2: Convert to fraction form
   12,619.83/18,929.80 = 3,854.72/x
3. Step 3: Cross multiply
   12,619.83x = 18,929.80 × 3,854.72
4. Step 4: Simplify right side
   12,619.83x = 72,969,130.80
5. Step 5: Solve for x
   x = 72,969,130.80/12,619.83
6. Step 6: Final answer
   x = 5,782.10