Finding the Fourth Proportional to 12,680.83, 19,010.93 and 5,290.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.83 : 19,010.93 = 5,290.79 : x
2. Step 2: Convert to fraction form
   12,680.83/19,010.93 = 5,290.79/x
3. Step 3: Cross multiply
   12,680.83x = 19,010.93 × 5,290.79
4. Step 4: Simplify right side
   12,680.83x = 100,582,838.33
5. Step 5: Solve for x
   x = 100,582,838.33/12,680.83
6. Step 6: Final answer
   x = 7,931.88