Finding the Fourth Proportional to 2,654.07, 3,980.88 and 805.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,654.07 : 3,980.88 = 805.17 : x
2. Step 2: Convert to fraction form
   2,654.07/3,980.88 = 805.17/x
3. Step 3: Cross multiply
   2,654.07x = 3,980.88 × 805.17
4. Step 4: Simplify right side
   2,654.07x = 3,205,285.15
5. Step 5: Solve for x
   x = 3,205,285.15/2,654.07
6. Step 6: Final answer
   x = 1,207.69