Finding the Fourth Proportional to 13,086.57, 19,622.41 and 8,931.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.57 : 19,622.41 = 8,931.61 : x
2. Step 2: Convert to fraction form
   13,086.57/19,622.41 = 8,931.61/x
3. Step 3: Cross multiply
   13,086.57x = 19,622.41 × 8,931.61
4. Step 4: Simplify right side
   13,086.57x = 175,259,642.00
5. Step 5: Solve for x
   x = 175,259,642.00/13,086.57
6. Step 6: Final answer
   x = 13,392.33