Finding the Fourth Proportional to 12,680.76, 19,010.84 and 5,290.73

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.76 : 19,010.84 = 5,290.73 : x
2. Step 2: Convert to fraction form
   12,680.76/19,010.84 = 5,290.73/x
3. Step 3: Cross multiply
   12,680.76x = 19,010.84 × 5,290.73
4. Step 4: Simplify right side
   12,680.76x = 100,581,160.76
5. Step 5: Solve for x
   x = 100,581,160.76/12,680.76
6. Step 6: Final answer
   x = 7,931.79