Finding the Fourth Proportional to 2,591.78, 3,885.46 and 1,129.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.78 : 3,885.46 = 1,129.84 : x
2. Step 2: Convert to fraction form
   2,591.78/3,885.46 = 1,129.84/x
3. Step 3: Cross multiply
   2,591.78x = 3,885.46 × 1,129.84
4. Step 4: Simplify right side
   2,591.78x = 4,389,935.59
5. Step 5: Solve for x
   x = 4,389,935.59/2,591.78
6. Step 6: Final answer
   x = 1,693.80