Finding the Fourth Proportional to 12,680.51, 19,010.46 and 5,290.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.51 : 19,010.46 = 5,290.48 : x
2. Step 2: Convert to fraction form
   12,680.51/19,010.46 = 5,290.48/x
3. Step 3: Cross multiply
   12,680.51x = 19,010.46 × 5,290.48
4. Step 4: Simplify right side
   12,680.51x = 100,574,430.73
5. Step 5: Solve for x
   x = 100,574,430.73/12,680.51
6. Step 6: Final answer
   x = 7,931.42