Finding the Fourth Proportional to 12,979.64, 19,383.00 and 12,840.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,979.64 : 19,383.00 = 12,840.83 : x
2. Step 2: Convert to fraction form
   12,979.64/19,383.00 = 12,840.83/x
3. Step 3: Cross multiply
   12,979.64x = 19,383.00 × 12,840.83
4. Step 4: Simplify right side
   12,979.64x = 248,893,735.51
5. Step 5: Solve for x
   x = 248,893,735.51/12,979.64
6. Step 6: Final answer
   x = 19,175.70