Finding the Fourth Proportional to 13,821.79, 19,074.59 and 7,854.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,821.79 : 19,074.59 = 7,854.47 : x
2. Step 2: Convert to fraction form
   13,821.79/19,074.59 = 7,854.47/x
3. Step 3: Cross multiply
   13,821.79x = 19,074.59 × 7,854.47
4. Step 4: Simplify right side
   13,821.79x = 149,820,794.92
5. Step 5: Solve for x
   x = 149,820,794.92/13,821.79
6. Step 6: Final answer
   x = 10,839.46