Finding the Fourth Proportional to 6,561.30, 9,836.44 and 2,860.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,561.30 : 9,836.44 = 2,860.72 : x
2. Step 2: Convert to fraction form
   6,561.30/9,836.44 = 2,860.72/x
3. Step 3: Cross multiply
   6,561.30x = 9,836.44 × 2,860.72
4. Step 4: Simplify right side
   6,561.30x = 28,139,268.89
5. Step 5: Solve for x
   x = 28,139,268.89/6,561.30
6. Step 6: Final answer
   x = 4,288.67