Finding the Fourth Proportional to 3,615.86, 5,415.12 and 1,856.24

Step by Step Solution

1. Step 1: Write the proportion equation
   3,615.86 : 5,415.12 = 1,856.24 : x
2. Step 2: Convert to fraction form
   3,615.86/5,415.12 = 1,856.24/x
3. Step 3: Cross multiply
   3,615.86x = 5,415.12 × 1,856.24
4. Step 4: Simplify right side
   3,615.86x = 10,051,735.27
5. Step 5: Solve for x
   x = 10,051,735.27/3,615.86
6. Step 6: Final answer
   x = 2,779.91