Finding the Fourth Proportional to 12,759.31, 19,142.21 and 3,994.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,759.31 : 19,142.21 = 3,994.30 : x
2. Step 2: Convert to fraction form
   12,759.31/19,142.21 = 3,994.30/x
3. Step 3: Cross multiply
   12,759.31x = 19,142.21 × 3,994.30
4. Step 4: Simplify right side
   12,759.31x = 76,459,729.40
5. Step 5: Solve for x
   x = 76,459,729.40/12,759.31
6. Step 6: Final answer
   x = 5,992.47