Finding the Fourth Proportional to 3,980.88, 5,973 and 2,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.88 : 5,973 = 2,131.50 : x
2. Step 2: Convert to fraction form
   3,980.88/5,973 = 2,131.50/x
3. Step 3: Cross multiply
   3,980.88x = 5,973 × 2,131.50
4. Step 4: Simplify right side
   3,980.88x = 12,731,449.50
5. Step 5: Solve for x
   x = 12,731,449.50/3,980.88
6. Step 6: Final answer
   x = 3,198.15