Finding the Fourth Proportional to 6,560.71, 9,839.68 and 2,118.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,560.71 : 9,839.68 = 2,118.78 : x
2. Step 2: Convert to fraction form
   6,560.71/9,839.68 = 2,118.78/x
3. Step 3: Cross multiply
   6,560.71x = 9,839.68 × 2,118.78
4. Step 4: Simplify right side
   6,560.71x = 20,848,111.89
5. Step 5: Solve for x
   x = 20,848,111.89/6,560.71
6. Step 6: Final answer
   x = 3,177.72