Finding the Fourth Proportional to 12,680.96, 19,009.02 and 5,290.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.96 : 19,009.02 = 5,290.52 : x
2. Step 2: Convert to fraction form
   12,680.96/19,009.02 = 5,290.52/x
3. Step 3: Cross multiply
   12,680.96x = 19,009.02 × 5,290.52
4. Step 4: Simplify right side
   12,680.96x = 100,567,600.49
5. Step 5: Solve for x
   x = 100,567,600.49/12,680.96
6. Step 6: Final answer
   x = 7,930.60