Finding the Fourth Proportional to 2,591.67, 3,885.35 and 1,129.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.67 : 3,885.35 = 1,129.76 : x
2. Step 2: Convert to fraction form
   2,591.67/3,885.35 = 1,129.76/x
3. Step 3: Cross multiply
   2,591.67x = 3,885.35 × 1,129.76
4. Step 4: Simplify right side
   2,591.67x = 4,389,487.94
5. Step 5: Solve for x
   x = 4,389,487.94/2,591.67
6. Step 6: Final answer
   x = 1,693.69