Finding the Fourth Proportional to 12,999.58, 17,939.57 and 7,893.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,999.58 : 17,939.57 = 7,893.64 : x
2. Step 2: Convert to fraction form
   12,999.58/17,939.57 = 7,893.64/x
3. Step 3: Cross multiply
   12,999.58x = 17,939.57 × 7,893.64
4. Step 4: Simplify right side
   12,999.58x = 141,608,507.33
5. Step 5: Solve for x
   x = 141,608,507.33/12,999.58
6. Step 6: Final answer
   x = 10,893.31