Finding the Fourth Proportional to 12,983.83, 19,493.04 and 8,781.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,983.83 : 19,493.04 = 8,781.20 : x
2. Step 2: Convert to fraction form
   12,983.83/19,493.04 = 8,781.20/x
3. Step 3: Cross multiply
   12,983.83x = 19,493.04 × 8,781.20
4. Step 4: Simplify right side
   12,983.83x = 171,172,141.48
5. Step 5: Solve for x
   x = 171,172,141.48/12,983.83
6. Step 6: Final answer
   x = 13,183.49