Finding the Fourth Proportional to 13,086.72, 19,629.88 and 5,290

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.72 : 19,629.88 = 5,290 : x
2. Step 2: Convert to fraction form
   13,086.72/19,629.88 = 5,290/x
3. Step 3: Cross multiply
   13,086.72x = 19,629.88 × 5,290
4. Step 4: Simplify right side
   13,086.72x = 103,842,065.20
5. Step 5: Solve for x
   x = 103,842,065.20/13,086.72
6. Step 6: Final answer
   x = 7,934.92