Finding the Fourth Proportional to 12,869.89, 19,304.85 and 5,078.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,869.89 : 19,304.85 = 5,078.50 : x
2. Step 2: Convert to fraction form
   12,869.89/19,304.85 = 5,078.50/x
3. Step 3: Cross multiply
   12,869.89x = 19,304.85 × 5,078.50
4. Step 4: Simplify right side
   12,869.89x = 98,039,680.73
5. Step 5: Solve for x
   x = 98,039,680.73/12,869.89
6. Step 6: Final answer
   x = 7,617.76