Finding the Fourth Proportional to 12,756.83, 19,139.09 and 3,991.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,756.83 : 19,139.09 = 3,991.82 : x
2. Step 2: Convert to fraction form
   12,756.83/19,139.09 = 3,991.82/x
3. Step 3: Cross multiply
   12,756.83x = 19,139.09 × 3,991.82
4. Step 4: Simplify right side
   12,756.83x = 76,399,686.59
5. Step 5: Solve for x
   x = 76,399,686.59/12,756.83
6. Step 6: Final answer
   x = 5,988.93