Finding the Fourth Proportional to 2,084.78, 3,126.90 and 697.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.78 : 3,126.90 = 697.79 : x
2. Step 2: Convert to fraction form
   2,084.78/3,126.90 = 697.79/x
3. Step 3: Cross multiply
   2,084.78x = 3,126.90 × 697.79
4. Step 4: Simplify right side
   2,084.78x = 2,181,919.55
5. Step 5: Solve for x
   x = 2,181,919.55/2,084.78
6. Step 6: Final answer
   x = 1,046.59