Finding the Fourth Proportional to 2,620.32, 3,932.40 and 1,321.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.32 : 3,932.40 = 1,321.89 : x
2. Step 2: Convert to fraction form
   2,620.32/3,932.40 = 1,321.89/x
3. Step 3: Cross multiply
   2,620.32x = 3,932.40 × 1,321.89
4. Step 4: Simplify right side
   2,620.32x = 5,198,200.24
5. Step 5: Solve for x
   x = 5,198,200.24/2,620.32
6. Step 6: Final answer
   x = 1,983.80