Finding the Fourth Proportional to 10,651.70, 15,978.72 and 2,861.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,651.70 : 15,978.72 = 2,861.12 : x
2. Step 2: Convert to fraction form
   10,651.70/15,978.72 = 2,861.12/x
3. Step 3: Cross multiply
   10,651.70x = 15,978.72 × 2,861.12
4. Step 4: Simplify right side
   10,651.70x = 45,717,035.37
5. Step 5: Solve for x
   x = 45,717,035.37/10,651.70
6. Step 6: Final answer
   x = 4,291.99