Finding the Fourth Proportional to 5,591.86, 8,387.70 and 1,431.83

Step by Step Solution

1. Step 1: Write the proportion equation
   5,591.86 : 8,387.70 = 1,431.83 : x
2. Step 2: Convert to fraction form
   5,591.86/8,387.70 = 1,431.83/x
3. Step 3: Cross multiply
   5,591.86x = 8,387.70 × 1,431.83
4. Step 4: Simplify right side
   5,591.86x = 12,009,736.96
5. Step 5: Solve for x
   x = 12,009,736.96/5,591.86
6. Step 6: Final answer
   x = 2,147.72