Finding the Fourth Proportional to 2,620.61, 3,934.56 and 1,322.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.61 : 3,934.56 = 1,322.99 : x
2. Step 2: Convert to fraction form
   2,620.61/3,934.56 = 1,322.99/x
3. Step 3: Cross multiply
   2,620.61x = 3,934.56 × 1,322.99
4. Step 4: Simplify right side
   2,620.61x = 5,205,383.53
5. Step 5: Solve for x
   x = 5,205,383.53/2,620.61
6. Step 6: Final answer
   x = 1,986.33