Finding the Fourth Proportional to 6,591.57, 9,888.34 and 2,147.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,591.57 : 9,888.34 = 2,147.78 : x
2. Step 2: Convert to fraction form
   6,591.57/9,888.34 = 2,147.78/x
3. Step 3: Cross multiply
   6,591.57x = 9,888.34 × 2,147.78
4. Step 4: Simplify right side
   6,591.57x = 21,237,978.89
5. Step 5: Solve for x
   x = 21,237,978.89/6,591.57
6. Step 6: Final answer
   x = 3,221.99