Finding the Fourth Proportional to 3,820.64, 5,275.61 and 3,112.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,820.64 : 5,275.61 = 3,112.61 : x
2. Step 2: Convert to fraction form
   3,820.64/5,275.61 = 3,112.61/x
3. Step 3: Cross multiply
   3,820.64x = 5,275.61 × 3,112.61
4. Step 4: Simplify right side
   3,820.64x = 16,420,874.50
5. Step 5: Solve for x
   x = 16,420,874.50/3,820.64
6. Step 6: Final answer
   x = 4,297.94