Finding the Fourth Proportional to 2,591.69, 3,886.32 and 1,129.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.69 : 3,886.32 = 1,129.64 : x
2. Step 2: Convert to fraction form
   2,591.69/3,886.32 = 1,129.64/x
3. Step 3: Cross multiply
   2,591.69x = 3,886.32 × 1,129.64
4. Step 4: Simplify right side
   2,591.69x = 4,390,142.52
5. Step 5: Solve for x
   x = 4,390,142.52/2,591.69
6. Step 6: Final answer
   x = 1,693.93